VR4K1S/CL. The Videx VR4K1S/CL is a vandal resistant 1 way surface mounted audio kit complete with keypad, based on the 4000 Series modular design. Up to 3 handsets can be connected to each button, making it ideal for bigger apartments. The VR4K1S/CL incorporates two way speech, an electronic call tone, a lock release facility and three LED's which display the confirmation of call, when the line is busy and when the lock is released. The incorporated keypad can be programmed from 1 to 99 seconds or latching output, and has 2 codes, 2 changeover relay outputs & an override input.. Vandal resistant. Surface mounted. 1 way. With keypad