2157-04: 4 Button Bi-Directional Entry Panel w/ Directory

The 2157 Series lobby panels are designed for indoor use. 

Type: Hands free loud speaking

Capacity: 4- 18 push buttons in groups of 2
Material: Extruded anodized aluminum. Speaker and mic protected by perforated screen and grill.
Mounting:  Recess mounted to BB91 back box OR surface mounted to BB92 back box (back box is an up charge)
Dim: 14”H x 4 “ W x 2 3/8” D
Dim: 15”H x 5 “ W x 2 3/8” D
Electrical: Screw type terminal push buttons are replaceable from the back.