Product Details:

Breaks the Acoustical Barrier with Clear, Reliable, Hands-Free Two-Way Conversation
Standard Unit Fits 1/4" to 1" (6 to 25 mm) Glass
Level 1 and Level 3 Bullet Resistant Models Adapt to Various Glazing Materials

The Thru-Glass Two-Way Electronic Communicator is a self-contained, easily installed device that allows clear, intelligible two-way conversation in locations where security must be maintained. The unit is automatically activated when the clerk speaks for hands-free operation. Incorporating the finest electrical design, you can select either the 115V AC model, or the 12V DC battery powered model. Units are available in Standard or Deluxe Models with satin anodized finish.

Color:  Satin Anodized Aluminum
Diameter:  5 in (127 mm)
Exterior Thickness:  1/2 in (12.7 mm)
Interior Can Thickness:  3-1/2 in (88.9 mm)

Minimum Order:  1 Each

The Standard Model TTU1D has a fixed gooseneck microphone. The Deluxe Model TTU1DJ has a removable gooseneck microphone. Both adapt for use with the optional TTU1HS Hands-Free Headset. All units are supplied complete with mounting hardware, instructions and power supply. Extension kit for glass thicker than 1 inch (25 millimeter) may be ordered separately.

Important Note:
This unit requires a three to four inch (76 to 102 millimeter) diameter hole for installation.