Intelligent Home Outdoor 433mhz Doorbell Waterproof Electronic Doorbell Button Portable Smart Home 220v Remote Control Doorbell<br> Receiver voltage: 100V-250V<br> Remote control voltage: 12V/23A<br> Volume: 4-gear adjustable (default maximum)<br> Ring tone: 25 adjustable<br> Standby power consumption: 6MA<br> Remote control emission current: 18-20MA<br> Operating frequency: 433.92MHZ<br> Horn power: 0.25W<br> Specifications:<br> 1. Intelligent wireless remote control doorbell<br> Plug and play wireless wiring, good sensitivity and strong penetration<br> 2. Smart wireless doorbell, to welcome the happy life, the remote control is pasted outside the door, the doorbell is plugged into the socket and the remote control is pressed, and the doorbell rings immediately<br> 3. It can be matched as you like. Users can configure one for one, one for two, etc. according to their own needs<br> 4. Simple installation without wiring and opening; No cumbersome setup<br> 5. The sound is loud, and the volume is adjustable at the fourth gear<br> It can be heard within a range of 150 square meters. It will not be noisy due to loud noise, and it will not be inaudible due to low noise; "Ding Dong, Ding Dong" and other 25 ringtones are optional<br> Package Included:<br> 1 * doorbell button, 1 * receiver/2 * doorbell button, 1 * receiver