[Long distance signal] The wireless signal with strong penetrating power can transmit signals up to 300 m in open space and long distance even in the presence of many obstacles (doors, walls). [36 melodies and 4 volume levels] By pressing the button on the receiver, you can select 36 types of CD ringtones, including 4 types of volume levels adjustable from 25 dB to 85 dB. [Waterproof Doorbell] The transmitter button is made of premium materials, and the waterproof level reaches IP44, which can ensure stable performance when used outdoors. outdoors without worrying about any weather conditions. [LED Flash] The button and blue LED flash on the receiver provide visual instructions for visitors and visitors. It is also an interesting and detailed design for the hearing impaired and will light up when 'use. [Easy installation] 2 steps to connect the portable receiver to any mains, and use the attached patch or screw to stick the transmitter on the wall. The receiver does not require batteries. Unplug the receiver so that the buzzer no longer rings. Product Name: Wireless Door Bell Color: White Sheet: European standard Specifications: (1 transmitter + 2 receiver) Waterproof: transmitter Waterproof degree IP44 Operating temperature: -30C to +70C Operating frequency: 433.92MHz + 75KHz Receiver voltage: 100-260V / 50-60Hz (wide voltage) Transmitter battery: 12V23A mercury-free environmental protection battery (with certification) Product certification: FCC, CE, ROSH, appearance patent, etc. Ringtone: 36 optional, learning code, DIY Volume: 0-100 decibels, 4 levels adjustable Packing list: 2x receiver, 1x transmitter, 1x double-sided tape, 1x screw (without battery)