Waterproof Intelligent Wireless Doorbell. Specifications: Itercom: No Connection Type: Wireless Alarm: Yes Power: Electric Supply Item Type: Wireless Doorbell Model:DG-ZXDB10 Connection Distance: 100m Power Supply: 110/220VAC Consumption: <5mA @Standby Radio Frequency: 433Mhz Selectable Melodies: 58 Volume Levels: 5(mute Included) Sound Level(typical): 85dBA Expandable: Up to 20 Receivers Operation Temperature: -10~55 Power Supply: DC 3V (CR2032 Lithium Battery X1) Transmitting Distance: <80m (Without Obstacles and No Interference) Package Included: 1 X Doorbell/Receiver 1 X Push Button/Transmitter . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.