The Havis ChargeGuard Select CG.X automatic on and off timer switch acts as a vehicle power management system by automatically turning on mobile equipment when starting the motor. The 12 V negative ground ignition sensing timer switch is designed for two-way radios, mobile data terminals, laptop computers, and other mobile computing devices. brbrThe ChargeGuard delay timer switch has a selectable timeout delay. When turning the motor off, equipment can stay on from 5 sec to infinity depending on what is programmed. This programmable timer delay switch comes pre-programmed with a two-hour delay as the default setting.brbrThis on and off timer switch wires directly to the battery or ignition switch in your vehicle. The ChargeGuard features your choice of sensing mode, automatic detection mode (AC), isolated alternator detection, voltage rise detection (DC only), or direct ignition mode (HL), depending on your preference.brbrThe Havis ChargeGuard Select delivers higher productivity and lower maintenance costs for your two-way mobile communication.