{"product_id":"contacta-sts-k021-glass-mounted-window-intercom-system-with-all-in-one-speaker-and-microphone-unit","title":"Contacta STS-K021 Glass-Mounted Window Intercom System with All-in-One Speaker and Microphone Unit","description":"\u003ccenter\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003eContacta STS-K021 Glass-Mounted Window Intercom System with All-in-One Speaker and Microphone Unit\u003c\/strong\u003e\u003c\/span\u003e\u003c\/center\u003e\u003ccenter\u003e\u003ciframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/XrJVvepQbpQ\" title=\"Contacta STS-K021 Window Intercom System\"\u003e\u003c\/iframe\u003e\u003c\/center\u003e\n\u003cp\u003eThe Contacta STS-K021 is a glass-mounted window intercom system built for indoor service counters where the customer side has security glass with a pre-cut communication hole. What sets the K021 apart from Contacta's other glass-mount kits is the STS-BL0 customer unit, a single Silver Sparkle-finished puck that combines the speaker and microphone into one all-in-one component mounted through the glass. That simplifies the install to a single customer-side hole and a single mounting kit, and it gives the finished counter a cleaner visual profile than kits with a separate overhead speaker and stem microphone. It's the right pick for indoor bank teller windows, credit union cash counters, transit fare booths, information desks, box office ticket windows, and government service counters where a permanent glass-mount install is planned, and the buyer wants everything integrated into one customer-facing unit.\u003c\/p\u003e\n\u003cp\u003eThe complete kit includes a Contacta STS-BL0 all-in-one glass-mounted customer speaker and microphone puck with the mounting kit, an STS-SU1-3W-SIL-400 Silver Sparkle finished staff unit with a 15.75-inch gooseneck microphone stem and a 5W speaker for the operator, an STS-A31H-BL8 window intercom amplifier, an IL-AE98 window-mounted hearing loop aerial for T-coil hearing aid users, and a PS-55 power supply.\u003c\/p\u003e\n\u003cp\u003eBehind the scenes, the STS-BL0 customer unit runs 5 W RMS into 4 ohms with 85 dB SPL output at 1 watt \/ 1 meter across a 150 Hz to 10,300 Hz speech-tuned range on the speaker side, and an omnidirectional cardioid-style microphone with a 100 Hz to 10,000 Hz response tuned to pick up the customer's voice from any angle at the puck. The staff-side STS-SU1-3W speaker matches the customer-side speaker specs, so both sides of the conversation have the same audio character. The STS-A31H-BL8 amplifier precision-drives both sides with less than 5 percent total harmonic distortion. The full system is CE, RoHS, and WEEE compliant; the amplifier meets FCC Class B EMC emissions and ICES-003.\u003c\/p\u003e\n\u003cp\u003eNote that the STS-K021 is not ballistic-rated. If your installation requires a bullet-resistant customer unit, Contacta manufactures the STS-K022 (Ballistic Level 3) and STS-K023 (Ballistic Level 8) as direct successors to the K021 with the same install pattern and ballistic-rated hardware. Call us at 800-207-2259 if you need help picking the right kit for your barrier type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFAQS:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What kind of installation is this kit designed for?\u003c\/strong\u003e\u003cbr\u003eA: The STS-K021 is designed for indoor service windows where the security glass or acrylic partition has a pre-cut communication hole and the buyer wants a single customer-side unit that handles both speaker and microphone. The STS-BL0 puck mounts directly on the glass. Typical installs are bank teller windows, credit union counters, transit fare booths, ticket windows, government service counters, information desks, and pharmacy consultation counters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How is this different from the STS-K020-S23 glass-mount kit?\u003c\/strong\u003e\u003cbr\u003eA: The K020-S23 uses two separate customer-side components: an STS-S23 overhead speaker mounted above the window and an STS-C100 stem microphone mounted at the counter. The K021 uses one integrated STS-BL0 puck that combines the speaker and microphone into a single unit at the glass. Choose the K021 for a simpler single-unit install and cleaner visual profile. Choose the \u003ca href=\"https:\/\/www.safeandvaultstore.com\/products\/contacta-sts-k020-s23-glass-mounted-window-intercom-system-with-overhead-speaker\" rel=\"noopener\" target=\"_blank\"\u003eK020-S23\u003c\/a\u003e when you want the speaker overhead and the microphone at counter level for better acoustic separation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the STS-K021 ballistic-rated?\u003c\/strong\u003e\u003cbr\u003eA: No, the STS-K021 is a non-ballistic-rated indoor kit. Contacta offers the same platform with ballistic-rated hardware in two variants: the STS-K022 with Ballistic Level 3 rating and the STS-K023 with Ballistic Level 8 rating. Call us at 800-207-2259 if you need help selecting the right ballistic level to match your glass supplier's rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the hearing loop work?\u003c\/strong\u003e\u003cbr\u003eA: The included IL-AE98 aerial is a thin 8.5\" x 8.5\" panel that mounts on the window and broadcasts the intercom audio directly into T-coil-equipped hearing aids in the immediate area, giving hearing-aid users a clean signal without ambient noise.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How many components come in the kit?\u003c\/strong\u003e\u003cbr\u003eA: The complete set includes the STS-A31H-BL8 window intercom amplifier, STS-SU1-3W-SIL-400 Silver Sparkle staff speaker and microphone unit, STS-BL0 all-in-one customer-side speaker and microphone puck with glass mounting kit, IL-AE98 window-mounted hearing loop aerial, and PS-55 power supply.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is installation complicated?\u003c\/strong\u003e\u003cbr\u003eA: The electronics are plug-and-play, but the STS-BL0 puck mounts permanently through a hole in the glass, and the amplifier and staff unit need to be positioned inside the operator's workstation. Plan for a professional installer if you're not comfortable working with security glass hardware or running low-voltage cable through a service counter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAll-in-One Customer Unit - STS-BL0 combines speaker and microphone into one Silver Sparkle-finished puck mounted through the glass\u003c\/li\u003e\n\u003cli\u003eSimpler Install - One customer-side hole and one mounting kit versus separate speaker and microphone components\u003c\/li\u003e\n\u003cli\u003eGooseneck Staff Microphone - 15.75\" flexible stem lets the operator position the microphone precisely for their workstation\u003c\/li\u003e\n\u003cli\u003eSilver Sparkle Finish - Powder-coated Silver Sparkle metalwork on both the staff unit and customer puck for a matched, upmarket install\u003c\/li\u003e\n\u003cli\u003eFull Duplex Communication - Simultaneous two-way audio with no push-to-talk delay\u003c\/li\u003e\n\u003cli\u003eHearing Loop Included - IL-AE98 window-mounted aerial for T-coil hearing aid users\u003c\/li\u003e\n\u003cli\u003eComplete System Kit - Comes with all major components:\n\u003cul\u003e\n\u003cli\u003eSTS-A31H-BL8 Window Intercom Amplifier\u003c\/li\u003e\n\u003cli\u003eSTS-SU1-3W-SIL-400 Staff Unit Speaker and Microphone (Silver Sparkle, 15.75\" gooseneck)\u003c\/li\u003e\n\u003cli\u003eSTS-BL0 All-in-One Customer-Side Speaker and Microphone with Glass Mounting Kit\u003c\/li\u003e\n\u003cli\u003eIL-AE98 Window-Mounted Hearing Loop Aerial\u003c\/li\u003e\n\u003cli\u003ePS-55 Power Supply\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eWide Frequency Response - Speakers cover 150 Hz to 10,300 Hz; customer microphone covers 100 Hz to 10,000 Hz; staff microphone covers 150 Hz to 10,500 Hz\u003c\/li\u003e\n\u003cli\u003eCompact Amplifier Unit - ABS plastic housing with membrane push-button power control\u003c\/li\u003e\n\u003cli\u003eStandards Compliant - CE, RoHS, WEEE compliant; FCC Class B EMC emissions; ICES-003\u003c\/li\u003e\n\u003cli\u003eFlexible Power - PS-55 14V DC supply with efficient low-current operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe STS-K021 is designed for indoor service windows with communication holes cut through the glass where a single integrated customer-side unit is preferred over separate speaker and microphone components. Ideal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBank and Credit Union Teller Windows\u003c\/li\u003e\n\u003cli\u003ePost Offices and Shipping Counters\u003c\/li\u003e\n\u003cli\u003eTheater and Box Office Ticket Windows\u003c\/li\u003e\n\u003cli\u003eInformation Desks and Visitor Centers\u003c\/li\u003e\n\u003cli\u003ePublic Transit Fare Booths\u003c\/li\u003e\n\u003cli\u003eEmbassies and Consular Service Windows\u003c\/li\u003e\n\u003cli\u003eGovernment Buildings and Municipal Service Counters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eModel: STS-K021 Window Intercom System with All-in-One Glass-Mount Customer Unit\u003c\/li\u003e\n\u003cli\u003ePower Supply: PS-55 (Input 100-240 V, Output 14 V DC, 2.14 A, 30 W max)\u003c\/li\u003e\n\u003cli\u003eStandards: CE, RoHS, WEEE compliant; FCC Class B EMC emissions; ICES-003\u003c\/li\u003e\n\u003cli\u003eBallistic Rating: Non-ballistic (see STS-K022 for Level 3, STS-K023 for Level 8)\u003c\/li\u003e\n\u003cli\u003eConstruction: Mixed materials, mild steel and SR500 steel customer unit, ABS plastic amplifier housing\u003c\/li\u003e\n\u003cli\u003eFinish: Powder-coated Silver Sparkle metalwork; matt black amplifier\u003c\/li\u003e\n\u003cli\u003eBoxed Dimensions: 5.90\" H x 20.40\" W x 12.50\" D\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSystem Components:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSTS-A31H-BL8 Window Intercom Amplifier\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupply Voltage: 12-14 V DC\u003c\/li\u003e\n\u003cli\u003eQuiescent Current: 100 mA typical\u003c\/li\u003e\n\u003cli\u003eOperating Current: 2 A typical on speech peaks\u003c\/li\u003e\n\u003cli\u003eSpeaker Output Power: 2.5 W RMS @ 8 Ω \/ 4.4 W RMS @ 4 Ω\u003c\/li\u003e\n\u003cli\u003eLoop Drive: Constant current, bounded by 4 V RMS \u0026amp; 2 A RMS\u003c\/li\u003e\n\u003cli\u003eTotal Harmonic Distortion: \u0026lt;5% (loop + speakers)\u003c\/li\u003e\n\u003cli\u003eMicrophones: Electret, 5 V supply via 2.2K load resistor\u003c\/li\u003e\n\u003cli\u003ePower Switch: Push on\/push off tactile switch under membrane\u003c\/li\u003e\n\u003cli\u003eDimensions: 1.58\" H x 4.58\" W x 4.50\" D\u003c\/li\u003e\n\u003cli\u003eWeight: 0.32 Pounds\u003c\/li\u003e\n\u003cli\u003eHousing: ABS Plastic, Matt Black Fine Texture Finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSTS-SU1-3W-SIL-400 Staff Unit Speaker \u0026amp; Microphone (Silver Sparkle, Gooseneck)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpeaker Output: 5 W RMS @ 4 Ω\u003c\/li\u003e\n\u003cli\u003eSound Pressure Level: 85 dB @ 1 W \/ 1 m\u003c\/li\u003e\n\u003cli\u003eSpeaker Frequency Response: 150 Hz - 10,300 Hz\u003c\/li\u003e\n\u003cli\u003eMicrophone Type: Cardioid directional electret\u003c\/li\u003e\n\u003cli\u003eMicrophone Sensitivity: 49.5 dB ± 2 dB @ 1 kHz (0 dB = 1 V\/Pa)\u003c\/li\u003e\n\u003cli\u003eMicrophone Impedance: 1.6 kΩ\u003c\/li\u003e\n\u003cli\u003eMicrophone Frequency Response: 150 Hz - 10,500 Hz\u003c\/li\u003e\n\u003cli\u003eOverall Height: 18.50\"\u003c\/li\u003e\n\u003cli\u003eMicrophone Gooseneck Stem Length: 15.75\"\u003c\/li\u003e\n\u003cli\u003eBase Width x Depth: 3.80\" W x 6.02\" D\u003c\/li\u003e\n\u003cli\u003eWeight: 1.79 Pounds\u003c\/li\u003e\n\u003cli\u003eConstruction: Mild steel, powder-coated Silver Sparkle finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSTS-BL0 All-in-One Customer-Side Speaker and Microphone with Glass Mounting Kit\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpeaker Output: 5 W RMS\u003c\/li\u003e\n\u003cli\u003eSpeaker Impedance: 4 Ω\u003c\/li\u003e\n\u003cli\u003eSound Pressure Level: 85 dB @ 1 W \/ 1 m\u003c\/li\u003e\n\u003cli\u003eSpeaker Frequency Response: 150 Hz - 10,300 Hz\u003c\/li\u003e\n\u003cli\u003eMicrophone Directional Response: Omnidirectional\u003c\/li\u003e\n\u003cli\u003eMicrophone Sensitivity: -44 dB ± 3 dB @ 1 kHz (0 dB = 1 V\/Pa)\u003c\/li\u003e\n\u003cli\u003eMicrophone Impedance: 1.0 kΩ ± 30%\u003c\/li\u003e\n\u003cli\u003eMicrophone Frequency Response: 100 Hz - 10,000 Hz\u003c\/li\u003e\n\u003cli\u003eDimensions: 5.51\" diameter x 4.84\" depth\u003c\/li\u003e\n\u003cli\u003eConstruction: Mixed materials, mild steel and SR500 steel\u003c\/li\u003e\n\u003cli\u003eFinish: Powder-coated Silver Sparkle\u003c\/li\u003e\n\u003cli\u003eBallistic Rating: Non-ballistic\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIL-AE98 Window-Mounted Hearing Loop Aerial\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 8.50\" H x 8.50\" W x 0.01\" D\u003c\/li\u003e\n\u003cli\u003eWeight: 0.26 Pounds\u003c\/li\u003e\n\u003cli\u003eConnection Cable Length: 6.5 ft\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePS-55 Power Supply\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInput: 100-240 V AC, 50-60 Hz, 1 A max\u003c\/li\u003e\n\u003cli\u003eOutput: 14 V DC, 2.14 A, 30 W max\u003c\/li\u003e\n\u003cli\u003eCable Length: 70.87\"\u003c\/li\u003e\n\u003cli\u003eDimensions: 1.38\" H x 2.08\" W x 3.92\" D\u003c\/li\u003e\n\u003cli\u003eWeight: 0.51 Pounds\u003c\/li\u003e\n\u003cli\u003eConstruction: ABS Plastic, Black Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Contacta Inc","offers":[{"title":"Default Title","offer_id":41640622391354,"sku":"STS-K021","price":2069.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1147\/6518\/files\/K023-kit-AV.png?v=1788975881","url":"https:\/\/www.safeandvaultstore.com\/products\/contacta-sts-k021-glass-mounted-window-intercom-system-with-all-in-one-speaker-and-microphone-unit","provider":"Safe and Vault Store.com","version":"1.0","type":"link"}