Features: 1. Supports pairing with your wifi doorbell. 2. Easy to install and use. 3. 52 Different melodies for selection. 4. Ultra-low power design, power saving and long-lasting use. 5. The remote controlled wireless doorbell you always needed: Forget about wires, cords, drilling through walls, and electrician bills. 6. Designed for flexibility and utility, this wireless doorbell for home comes, so that you can hear their chime no matter where you are. Specification: Color:Black Working voltage: AC 90~250V Working frequency: 433.92mhz +/-280 KHz Power consumption: 10 mW Transmission power :0dbm Sensitivity: - 110 DBM Net weight: 92 g Volume: up to 110db Size: 82×82×20 mm Package includes: 1 x Indoor Doorbell Receiver