Silver. This Bluetooth proximity keypad offers entry to a single door using Bluetooth, a card/fob or keypad for up to 200 users. The operating distance for Bluetooth entry is up to 50 metres (164 feet) and it has a read range of 5cm for cards and fobs. A twelve button backlit keypad ensures easy use in darker areas and there is a built-in 85dB tamper alarm and buzzer.. 12 button backlit keypad. Multiple LED display with audible indication. 12V DC operating voltage. Bluetooth 4.2 BLE low energy