Features: 1.No Battery Required: Self generating wireless doorbell, wiring free, battery free, with stable signal transmission, low power consumption and environmental friendly. 2.38 Melodies: The wireless call button has 38 ringtones to choose from and adjustable sound levels, equipped with silent mode to facilitate the use of the elderly. 3.Long Operating Range: Strong penetration, the transmission distance is greater than 150m without blocking, it is always easy to be notified when someone calls from the door. 4.High Performance: Doorbell transmitter IP68 waterproof, not afraid of the sun, long service life, simple installation, can be used in homes, villas, hotels, factories. 5.Multifunctional: It can not only be used as a doorbell, but also as a pager, applicable for the elderly, pregnant women, patients use with simple operation. Specification: Item Type: Wireless Doorbell Set Material: ABS Power Supply: AC100V-230V Power Consumption: 0.25W Ringtones: 38 ringtones Transmission Distance: > 150m/492ft (Without blocking) RF Frequency: 433MHz Ringtone Volume: 50dB/1m PackageList: 1 x Doorbell 1 x Receiver 1 x Sticker 1 x Manual