Description :   120dB 9V Wired Siren Horn Speaker for GSM Security System Alarm  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.  Specifications :   Rated voltage : 9VDC Rated current : 100-150mA Sound index : 120dB Compatible : 3.5 mm Interface Sound frequency : 3.8KH2+10%  Package included :   1 x 120dB Wired Siren Horn  Details pictures :