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Wireless Doorbell Home Security Pir Motion Welcome Chime Door Sensor Sound Alarm 32 Song Smart Doorbell Ring Button Introduction: This smart wireless doorbell adopts advanced wireless transceiver technology, high-quality voice processing technology, up to 32 music, and its performance is stable and reliable. Doorbell, anti-theft, welcome multi-purpose. Suitable for home, villa, shop, hotel,and office etc. Main Features: 1- 32 songs optional. 2- Doorbell, alarm, welcome multi-purpose. 3- Can learn up to 30 transmitters, no loss of power. 4- Support 1527/2262 code chip.(button） 5- Volume 4 adjustable. 6- Support multiple doorbell transmitter, suitable for large house. Three Modes: 1- Infrared motion sensor welcome chime mode 2- Door sensor alarm mode 3- Doorbell mode Infrared Detecter Welcome Mode: When the infrared sensor detects a moving object it will send a signal to the doorbell, the doorbell emits a welcome sound. Door Sensor Alarm Mode: Install the door sensor on the door or window. When someone pushes to open the door or window, the doorbell will receive the signal and alarm. Normal Doorbell Mode: When you press the button, the doorbell receiver will receive the signal and you will hear the sweet tunes immediately. Easy to Install Just plug the receiver into power socket and attach the transmitter on door, you don't even necessarily have to make holes or damage anything. 32 Songs Optional 32 ringtones for your option,you can select regularly,and don't feel bored.Avoid the same ring with the neighbors. Strong signal ,150m long distance Transmission Long operating range can be up to 500ft(150m) in open space,great for large house including villas, apartment, offices, shops, warehouses, etc. DIY Your Own Set Technical parameter： 1. Working voltage: AC 100-220V 2. Working current: <100mA 3. Wireless frequency: 433MHz 4. Working temperature: -10 ° C -50 ° C 5. Wireless distance: 150 meters (open space)