Okasha Smart Siren 433Mhz

Features • Built-in Battery: 7.4V 400mAh Lithium Battery • Input Power: AC100~240V 50/60Hz • Standby Current: 15.5mA • Alarm Current :<300 mA • Working Temprature: -10C ~+50C • Relative Humidity: <95% (no Condensation) • Alarm Volume: 120bB • Wireless Defence Zone: 4 • Wireless Parameters: 433MHz, ev1527 • Product size : 155x100x45mm • Application: home , office , mall, warehouse     Wireless Outdoor siren with 120db sound and flash . it doesn't work alone. it has to work with a home alarm system. In event of intrusion, the alarm system will send a RF signal to the siren, and then siren will sound a piecing voice to deter the intruder. in the event of an intrusion, the alarm system will sand an RF to it, and the alarm will emit a high-decibel sound to block the intruder.