1、The wireless outdoor siren sounds 120dB sound, with flash, high quality and durable. 2、It does not work alone, it must be used in conjunction with a home alarm system. 3、In the event of an intrusion, the alarm system will send an RF signal to it, and the alarm will emit a high-decibel sound to block the intruder. 4、It uses micro-technical control circuitry to ensure high accuracy and reliability. 5、It can be widely used in shops, warehouses, offices, homes, etc. Features: The wireless outdoor siren sounds 120dB sound, with flash, high quality and durable. It does not work alone, it must be used in conjunction with a home alarm system. In the event of an intrusion, the alarm system will send an RF signal to it, and the alarm will emit a high-decibel sound to block the intruder. It uses micro-technical control circuitry to ensure high accuracy and reliability. It can be widely used in shops, warehouses, offices, homes, etc. Specifications: Condition: Brand New Material: ABS plastics Standby current: ≤15mA Alarm current: ≤300mA Built-in backup battery: 7.4V 400mA rechargeable lithium battery Volume: 120dB (factory default alarm sounds 180 seconds) Standby time: 15 hours (full charge) Operating temperature: -10-50 degrees Celsius Packing size: Approx.16*12*10cm/6.3*4.7*3.9in Weight: Approx.400g/14.1oz Package List: 1 * Wireless Siren 1 * Power Adapter 1 * Manual