The PAC Audio TR12 is a must have for every shop. It can be used for custom work, alarm work and to control multiple devices in your vehicle. The PACTR12 is a smart trigger module that offers a total of four channels and can be programmed individually to provide positive or negative outputs. Conveniently, the type of output for each channel can be defined such as pulsed, latched, timed, ground, and positive 12 Volt with up to three amps of current. The unit is programmable using a PC to control the outputs with accuracy.