LCD 2-way wireless keypad. Backlit blue LCD. Up to 3 wireless keypads per system. Tamper: Wall and cover. 2-button emergency keys. Frequencies: 868.65MHz. Dimensions (H x W x D): 150 x 120 x 45mm. Power supply: 3 CR123 Lithium batteries, average battery life: 3 years. Consumption: 10?A at rest, Max current / 100 mA.