Strong signalThe signal can penetrate obstacles such as doors and walls very well. With a sufficient range of up to 300 m in open area, the Charlmein wireless doorbell is perfect for 2-storey villas with garden, office, commercial premises. Waterproof wireless doorbell The garden doorbell is made of high-quality IP44 waterproof material. quality. Operating between -30C and 70C, the radio doorbell is suitable for outdoor use. The radio doorbell can withstand rain and snow, for example. 36 melodies and 4 volumes Huge ringtones ranging from standard DingDong Carnon to animal noises, jingle bells, etc. in good sound quality are available. The volume is easily adjustable in 4 levels from 25 dB to 85 dB. 2 transmitters and 2 receivers The Charlemain wireless doorbell set uses an independent digital code system, saving you the worry of possible interference with your neighbors' system. You get 2 transmitters, 2 receivers, screws, tape, mini screwdriver, 1 year warranty and 24-hour online customer service. Easy Installation Simply plug the receiver into the outlet of your choice and install the push button with the provided screws or adhesive tape to the wall or door frame. The receiver does not require a battery.