The Contacta STS-K003 Flush Mounted Window Intercom System is designed for clear, effortless communication in areas where glass or security screens obstruct the view. Whether you're at a bank teller window, pharmacy counter, ticket booth, government office, or information center, this system ensures staff and customers can hear each other clearly, eliminating the need to shout through the glass or repeat oneself. It's the ideal solution for smooth, professional interactions while maintaining safety and privacy on both sides of the counter.

The complete kit includes everything you need for instant clarity: flush-mounted customer speaker (STS-S61) and omnidirectional microphone (STS-M56) modules that install directly into the counter surface, a staff microphone and speaker unit with dual mute, a high-performance amplifier, and an under-counter hearing loop for customers using hearing aids. With its durable mild-steel construction and sleek powder-coated finish, it's designed for heavy daily use in busy public environments. And because it's pre-engineered for plug-and-play setup, you can have it up and running quickly once the counter cutouts are made.

Behind the scenes, the STS-K003 uses advanced technology to ensure high-quality sound and reliable operation. The cardioid staff microphone and omnidirectional customer microphone capture speech clearly, while the precision-tuned amplifier delivers crystal-clear audio on both sides of the barrier. The integrated hearing loop makes it fully accessible, and the flush-mount design keeps the customer counter completely clear with nothing protruding above the surface, ideal for premium installations where visual cleanliness matters. Reliable, efficient, and ADA-friendly, this is the professional standard for modern service counters.

FAQS:

Q: What is the difference between the STS-K003, the STS-K002, and the STS-K001?
A: All three kits provide the same two-way audio and hearing loop functionality. The STS-K003 uses flush-mounted customer speaker (STS-S61) and microphone (STS-M56) modules that install into the counter surface for the cleanest possible look, with nothing protruding above the counter. The STS-K002 uses separate surface-mounted modules (STS-S60 speaker and STS-M54 microphone) that sit on top of the counter. The STS-K001 mounts both customer units on a single steel bridge bar that spans the customer counter.

Q: Does the STS-K003 require counter modification?
A: Yes. Because the customer speaker and microphone are flush mounted, you'll need to cut mounting holes in the counter surface at the installation locations. Refer to the STS-S61 and STS-M56 component dimensions below when planning cutouts.

Q: What types of locations use the STS-K003 system?
A: It's perfect for any environment where glass or barriers make normal conversation difficult, such as banks, post offices, theaters, information centers, public transit systems, ticket counters, embassies, and government buildings.

Q: Does this system include a hearing loop for customers with hearing aids?
A: Yes. The STS-K003 includes an under-counter hearing loop aerial (IL-AE99) that transmits sound directly to hearing aids equipped with a T-coil.

Q: How many components come in the kit?
A: The complete set includes the STS-A31H amplifier, STS-SU1-3W staff microphone and speaker unit (dual mute), STS-S61 customer flush-mounted speaker, STS-M56 customer flush-mounted microphone, IL-AE99 hearing loop aerial, and PS-55 power supply.

Q: Is installation complicated?
A: The electronics are plug-and-play with minimal wiring. The main additional step compared to a surface-mount kit is cutting counter apertures for the flush-mount speaker and microphone.

Q: What colors are available?
A: The STS-K003 is available in three finishes: two powder-coated options (Gray Leatherette / STS-K003-G and Black Textured / STS-K003-B), and a Stainless Steel option (STS-K003-SS).

Features:

• Clear Two-Way Communication - Enables staff and customers to communicate clearly through security screens or barriers.
• Integrated Hearing Loop - Includes an under-counter hearing loop aerial (IL-AE99) to assist customers with hearing aids (T-coil compatible).
• Complete System Kit - Comes with all major components:
  • STS-A31H Window Intercom Amplifier
  • STS-SU1-3W Staff Unit Speaker and Microphone (dual mute)
  • STS-S61 Customer Flush Mounted Speaker
  • STS-M56 Customer Flush Mounted Microphone
  • IL-AE99 Under-Counter Hearing Loop Aerial
  • PS-55 Power Supply
• Flush-Mounted Design - Speaker and microphone install directly into the counter for the cleanest possible aesthetic with nothing protruding above the surface.
• Dual Mute Function - Allows staff to control communication flow with privacy when needed.
• High-Quality Audio - Cardioid staff microphone and omnidirectional customer microphone paired with 5W RMS speakers deliver excellent sound clarity with a wide frequency response.
• Constant Current Loop Drive - Ensures consistent performance for hearing aid users.
• Rugged Construction - Mild steel metalwork with powder-coated finish (Gray Leatherette or Black Textured). It is also available in a Stainless Steel finish. 
• Flexible Power Options - Powered via the PS-55 14V DC power supply, with efficient low-current operation.
• Compact Amplifier Unit - ABS plastic housing with membrane push-button power control.
• Tamper-Resistant Design - Durable metal construction for secure installations in public or high-traffic environments.
• Easy Installation - Electronics are plug-and-play; the flush-mount design requires counter apertures for the speaker and microphone modules.
• Compliant Standards - CE, RoHS, WEEE, and BS EN 60118-4 (when correctly installed).

Applications:

The STS-K003 Window Intercom System is designed for any setting that requires clear communication through glass, partitions, or security barriers. Ideal for:

• Banks
• Post Offices
• Theaters and Ticket Counters
• Information Centers
• Public Transit Systems
• Embassies and Consulates
• Government Buildings
• Reception or Security Windows

Technical Specifications:

• Model: STS-K003 Window Intercom System with Hearing Loop
• Item Codes: STS-K003-G (Gray Leatherette) / STS-K003-B (Black Textured) / STS-K003-SS (Stainless Steel)
• Power Supply: PS-55 (Input 100-240 V, Output 14 V DC, 2.14 A, 30 W max)
• Compliance: CE, RoHS, WEEE; BS EN 60118-4 (in correct installations)
• Construction: Mild steel (main system), ABS plastic amplifier housing
• Finish Options: Powder-coated Gray Leatherette, Black Textured, or Stainless Steel
• Boxed Dimensions: 5.12" H x 13.39" W x 9.45" D
• Weight (boxed): 5.29 Pounds

System Components:

STS-A31H Window Intercom Amplifier

• Supply Voltage: 12-14 V DC
• Quiescent Current: 100 mA typical
• Operating Current: 2 A typical on speech peaks
• Speaker Output Power: 2.5 W RMS @ 8 Ω / 4.4 W RMS @ 4 Ω
• Loop Drive: Constant current, bounded by 4 V RMS & 3 A RMS
• Total Harmonic Distortion: <5% (loop + speakers)
• Microphones: Electret, 5 V supply via 2.2K load resistor
• Power Switch: Push on/push off tactile switch under membrane
• Dimensions: 1.58" H x 4.58" W x 4.50" D
• Weight: 0.32 Pounds
• Housing: ABS Plastic, Matt Black Fine Texture Finish

STS-SU1-3W Staff Unit Speaker & Microphone (Dual Mute)

• Speaker Output: 5W RMS @ 4 Ω
• Sound Pressure Level: 85 dB @ 1W/1 m
• Speaker Frequency Response: 150 Hz - 10,300 Hz
• Microphone Type: Cardioid directional electret
• Mic Sensitivity: 49.5 dB ± 2 dB @ 1 kHz (0 dB = 1 V/Pa)
• Mic Impedance: 1.6 kΩ ± 3% @ 1 kHz
• Mic Frequency Response: 150 Hz - 10,500 Hz
• Dimensions: 2.61" H (base), 14.50" H (extended), 3.80" W x 6.02" D
• Weight: 1.79 Pounds
• Construction: Mild Steel; Powder-coated Gray Leatherette or Black Textured

STS-S61 Customer Flush Mounted Speaker

• Speaker Output: 5 W RMS @ 4 Ω
• Sound Pressure Level: 85 dB @ 1 W/1 m
• Frequency Response: 150 Hz - 10,300 Hz
• Dimensions: 4.69" H x 2.57" W x 1.87" D
• Weight: 0.92 Pounds
• Construction: Mild Steel; Powder-coated Gray Leatherette or Black Textured

STS-M56 Customer Flush Mounted Microphone

• Directional Response: Omni-Directional
• Sensitivity: -42.5 ± 2.0 dB @ 1 kHz (0 dB = 1 V/Pa)
• Impedance: 2 kΩ @ 1 kHz
• Frequency Response: 100 Hz - 5,000 Hz
• Dimensions: 4.69" H x 2.57" W x 0.78" D
• Weight: 0.35 Pounds
• Construction: Mild Steel; Powder-coated Gray Leatherette or Black Textured

IL-AE99 Under-Counter Hearing Loop Aerial

• Construction: Copper wire with PVC casing
• Finish: Black
• Dimensions: Molded to the required size during installation
• Weight: 0.19 pounds

PS-55 Power Supply

• Input: 100-240 V AC, 50-60 Hz, 1 A max
• Output: 14 V DC, 2.14 A, 30 W max
• Cable Length: 70.87"
• Dimensions: 1.38" H x 2.08" W x 3.92" D
• Weight: 0.51 Pounds
• Construction: ABS Plastic, Black Finish