Wirele Doorbell No Battery Required Waterproof Self-Powered Intelligent DoorBell Set Home Outdoor Kinetic Ring Chime DoorbellFeature:1. Power supply mode:No battery is needed, just plug the receiver into the socket to generate power by preing. Pre your finger gently, and the mechanical energy will be converted into electrical energy2. Multi function:Not only doorbell, but also your safety steward. It can be hung around your neck and become a portable pager3. Waterproof grade:IP44 dustproof and waterproof, outdoor installation, safe and durable4. Transmiion distance:Open space 150m, indoor 30m, long-distance transmiion, strong penetration5. RF frequency:The frequency of wirele doorbell is 433MHz, with 38 music ringtones, which can be switched at willSpecification:Certification: CE,RoHS,FCCOrigin: Mainland ChinaAlarm: YesItem Type: Wirele DoorbellConnection Type: WireleModel: QX-008Power supply: 110V-230V-50HzTransmiion distance: Open space 150m, indoor 30mPower consumption: 0.25WRinging tone: 38 pieces of musicRF frequency: 433MHzRinging volume: 80dB, 1m/3.28ftReceiver: US, EU, UKColor: Black/whiteNet weight: 114.8gButton size: 66x40x20mm/2.6x1.57x0.79inReceiver: 78x54x20mm/3.07x2.13x0.79inPackage size: 90x73x70mm/3.54x2.87x2.76in Note:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!Please allow 1-2cm measuring deviation due to manual measurement. Packages:1 X Button1 X Receiver1 X Double-Sided Adhesive Tape1 X Instruction