This smart siren adopts ZB 3.0 Network  mode. When an alarm is triggered inside the house, this Smart Siren will issue a high decibel sound and flash  alarm, and  also send  alarm information to the  user timely and effectively to avail the user to handle the emergency timely.  About the gateway (hub):  This smart siren cannot be used alone, it must be connected to the gateway and then used with other Zb devices. such as Door Sensor and PIR Motion Sensor.    Note: This Zb siren uses the standard Zb protocol and can work with the gateway (hub) of the Zb standard protocol. Not compatible with Tuya Smart or Smart Life Gateway.    Product Feature:  1. Working Voltage: AC110-240V，Wide voltage operation, adapt to most countries.  2. Backup Battery（700mAh）.  Built-in rechargeable battery,After power off, the backup battery will startto work for 4 hours continuously the above.  3. 95dB alarm sound，The alarm is loud and there is also a flashing light,this siren will not only alert the neighbors of the intrusion, but scare away the burglar right out of your house     Product parameters:  1. Working Voltage: AC110-240V;  2. Backup Battery: 3.8V/700mA;  3. Alarm Sound Level: 95db(1m away);  4. Wireless Network Scope: <80m(open indoors);  5. Working Temperature: -10℃-50℃;  6. Working Humidity: <95% RH (Indicating no condensation);  7. Network Mode: Zb 3.0 (2.4Ghz);  8. Dimension: 80mm x 32mm;    Package included:  1 x Sound and Light Alarm(EU plug/ US plug optional)