Features: 1.Simple Installation: The installation of the doorbell requires no tools or electrical expertise, easy and convenient while contributing a stylish accent to the face of any home. 2.Sound Library: The wireless doorbell does not commit to one single sound every time the door rings, not bound to any one sound, containing a library of 38 music chord, good resonance effect and not harsh. 3.Not Only Doorbell: The doorbell has a strong and unique sound, can be hung on the old man's chest as a pager, convenient for find the problem and avoiding safety risks care more timely. 4.Frontal Cavity Design: The doorbell has front horn, sound transmission without obstruction, sound crisp without noise, transmission longer distance up to 30 meters. 5.Small And Portable: The doorbell has small size and light weight, portable, can be taken to anywhere for convenience at home or indoors. Specification: Item Type: Wireless Doorbell_x000D_ Material: ABS_x000D_ Operating Temperature: -20 to 60_x000D_ Battery: CR2032_x000D_ _x000D_ Plug Type: EU 100v-230V_x000D_ Battery type: Button Cell_x000D_ Battery Model: cr2032_x000D_ Battery capacity: 100mAh _x000D_ Waterproof Level: IP44 waterproof_x000D_ Operating Voltage: AC100-230v/50/60HZ _x000D_ Standby Power Consumption: 0.25W_x000D_ Operating Frequency: 433.92MHZ_x000D_ Music: 38 Songs _x000D_ Volume: 4 Gears (Including Mute)_x000D_ Controllable Volume: 0-90dB_x000D_ _x000D_ Receiving Distance 200m _x000D_ _x000D_ Receiver operating Temperature: -10 to 45 PackageList: 1 x Transmitter 1 x Receiver 1 x Instruction 1 x Double Sided tape