Norcon Communications
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Products > Corrections Series > TTU-4 Intercom

The TTU-4 Talk-Thru intercom system is particularly suitable for low ambient noise environments that require an unobtrusive, yet tamper-resistant voice communication system.

The TTU-4 is ideal for communication between prisoners and guests through a glass barrier when partitions providing acoustical isolation between visitors and between inmates in available. If no acoustical barriers contact our sales department for other options.

How it Works
The TTU-4 incorporates the same high-quality electronics as the basic patented Norcon TTU-1.

Because the TTU-4 is designed for applications in security areas, all controls and microphones are recessed to minimize unauthorized adjustment and tampering.

The TTU-4 comes ready to operate, simply mount the prism units on opposite sides of the barrier. Tamper-resistant screws are used for both units. The prism units can be positioned back-to-back or in any other configuration suitable for your environment. Cables may either be run through a small hole in the barrier, or under the countertop.

All Talk-Thru systems are shipped complete with mounting hardware, instructions, and power supply.


  • Clear, 2-way hands-free voice communication
  • No gooseneck microphone and no external controls
  • Rugged, tamper-resistant materials
  • Simple, one-person installation
  • No need to cut a hole in the barrier
  • Compact, contemporary design that fits any decor
  • One year warranty on base unit (optional two years extended warranty available)

For purchasing information, please contact our sales department.

Click here for catalog cut sheet
Click here for installation and operations manual

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(516) 239-0300 |

Request information about the TTU-4

Mechanical Specifications
  • Outside assembly: Machined aluminum, anodized finish, tamper-resistant
  • Inside assembly: Machined aluminum, anodized finish, tamper-resistant
  • Size (both assemblies): 2 in. H x 12 in. W x 2 in. D.
  • Weight: 2.5 lb
  • Mounting: Counter-top
  • Panel controls: No external controls
Electronic Specifications
  • Audio frequency response: Selectively shaped for maximum voice intelligibility.
  • Audio power: 2 watts per amplifier
  • Distortion: Less than 2%.
  • Listen mode: 20 dB compression
  • Talk mode: Vox
  • Microphones: Electret
  • Power supply: Input: 90-240 VAC, 60 Hz Output: 15 VDC, 1A. Level VI, UL & CE compliant switching power supply
Specifications are subject to change without notice.