Wireless Remote Control Electronic Siren ESAS-938: 1.Voltage:DC 12/24V 2.Power: 300 w 3.Function:> 8 tones and Microphone Manual button generates a variety of tones, providing hand-free operationCompact and install easilySound Available: Wail-1, Wail-2, Wail-3,Horm-1, Horm-2,Siren Auto Siren and Speaker:ESAS-938