audio door phone, Button, Surface mounted Voltage: 12V, Temperature: -10 ~+50 degree 110*200*57mm Audio Phone, intercom, audio intercom system, audio door phone Audio handsetColor: WhiteButton operationSurface mountedFunction: Talking/unlocking/transferringPower input: 12VWorking temperature:-10°C~50°C Dimension: 110×200×57(mm)