Rada 2nd Gen IP Intercom Keypad module, module connection with RS-485 , IP65,Backlight compensation, Flush mounting, Surface mounting, Unlock door via inputing password, powered by other module (Power input: 12VDC, Power output: 12VDC) 98.21 mm × 100.21 mm × 33.7 mm (3.87" × 3.95" × 1.33")