Feature: 100W/200W/300W series siren amplifier features 20 control buttons and 5 siren tones including wail, yelp, phaser,Hi-lo and Siren, For your convenience, there are also 3 momentary buttons to controlmultiple lights with multiple flash patterns.To program functions on a memory button,make sure the control head is activated and thepower switch is on. press the activated memory button once, select the modes andbuttons desired to be programmed for the memory function. With its standard wire blocks,the installation and wiring of the system is fast and easy.Voltage: 12V/24VPower: 100W/200W/300W availableAmplifier Size: 9.27" *2.90"*6.03 "deep