Features: Product Name: Self-powered Wireless Digital Doorbell Working voltage: Battery required Remote control distance: 100m (in an open environment) Waterproof rating: IP44 (life-resistant) Plug type: EU plug, applies to Indonesia, Germany, France, Spain, Italy, etc. Plug: European Volume adjustment: high/medium/low/mute Music: a variety of chords to choose from Color: White Material: ABS Description: Specializing in the production of high-quality multifunctional wireless doorbells. It can be used as a doorbell or an SOS call machine. The elderly and pregnant women can Take it with you and ask for help at any time in danger. Touch to trigger, no battery required, just press to trigger. The buttons are waterproof, so don't worry about long-term use. The remote control distance in open air can reach 100m and the working range is extremely long. Meets the needs of most residential and high-rise buildings. Easy to install with double-sided tape or screws. The working range in open