Description :<br>315MHz Wireless Siren Horn Speaker for GSM Security System Alarm<br>When the Siren Horn is alarming，120dB sound will break out，It will help you\/your neighbors of vigilance， and scare away the burglar out of your house.A necessary item for the home security system.<br>Specifications :<br>Rated voltage : 12VDCSound index : 120dBSound frequency : 3.8KH2+10%<br>Package included :<br>1 x 315MHz Wireless  Siren Horn1 x Wireless  Receiver<br>Details pictures :