GPS vehicle tracker/GPS AVL/camera AVL canera security Digital,analog I/O port 2 RS232 ... ,12V,24V,30V optional) Outputs Oil and electricity control, sound/light alarm, Remote controller signalAlarm System Hijack alarm, Anti-theft alarm ... decrease GPRS network flow. Multifunctional GPS vehicle tracker/GPS AVL/camera AVL, canera security enhanced RS3000C1