SPEC:
Max Key :16 key
Size: 85.6×40×9.5 (mm)
Battery : CR2025

IR remote controller.
It’s thinner remote controller, but it can used to rubber key.
And extend the keypad used times, reduce the defective.

This remote works with the Russound CAS44 multi-room audio system. Aim it at any of your in-wall keypads, and it lets you select your music source, adjust volume, and access the system's menu. Sensors built into the keypads receive IR (infrared) signals from the remote and transmit them via the system's CAT-5 cabling to control your source components.