[Long Distance Signal] Wireless signal with strong penetrating power can transmit signals up to 300m in open space and long distance even with many obstacles (doors, walls). [36 melodies and 4 volume levels] By pressing the button on the receiver, you can select 36 kinds of CD ringtones, including 4 kinds of 25dB adjustable volume levels at 85dB. [Waterproof doorbell] The button of the transmitter is made of materials, and the waterproof level reaches IP44 standard, which can ensure stable performance when it is in use. it is used outdoors without worrying about any weather conditions. [LED Flash] The button and blue LED flash on the receiver provide visual instructions to visitors and visitors. It is also an interesting and detailed design for the hearing impaired and s will light up when in 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 the ringer stops ringing. Product Name: Wireless Door] Bell Color: White Plug: European Standard Specification: (1 Transmitter + 2 receiver) Waterproof: Transmitter Waterproof degree IP44 Operating temperature: -30°C to +70°C Operating frequency: 433.92MHz + 75KHz Receiver voltage: 100-260V/50-60Hz (wide voltage) Transmitter battery: 12V23A mercury-free environment 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) getveryrich