Settings 1. Working voltage: AC 100-230V 2. Power Consumption: 0.25W 3. Wireless frequency: 433 MHz 4. Working temperature: -10C~+55C 5. Ring volume: 50dB/1m 6.Transmitter: No battery required Product Self-powered waterproof doorbell This doorbell requires no batteries, no wiring, plug and play, easy to install Built-in 38 music to choose from, 4 volume sections can be adjusted (including mute) IP44 waterproof rating of the transmitter, can effectively prevent rain intrusion, sunscreen and waterproof Remote control distance of 150m (area open)The indoor distance without partition is about 50 meters (These data are the test distance without barrier in the open area of the experiment. The actual distance is affected by the use environment. The more there is obstacles, the greater the distance. Please refer to the actual distance) The receiver can be plugged in directly, 90-240V can be used Usage scenarios: residential, hotel, villa, h hospital Function: Learning code Features 1: Strong signal Remote control distance of 150m (open area)The indoor distance without bulkhead is about 50 meters. (This data is the test distance without obstacles in the open area of the experiment. The actual distance is affected by the use environment. The more obstacles, the greater the distance. Please refer to the actual distance) Note: Do not install the transmitter next to the metal, the metal will affect the launch distance Feature 2: Transmitter IP44 Waterproof level Rainy days can also be used, safe and durable Feature 3: 38 kinds of ringtones, four volume levels The doorbell can be muted during the sleep Feature 4: Not only a doorbell but also a pager When the elderly, babies and pregnant women who sleep alone have needs, press the transmitter and the bell will ring.