Countdown timer is spring-activated (twist knob to set). Useful for fogging at the end of a workday so fumigation is done while everyone is gone. Countdown timer shuts off fogger at end of time period set. Spring-loaded manual dial (60 minute maximum). Useful for fogging at end of workday when facility is empty. 10 A contacts. Receptacle is for 100-120V plugs (NEMA 515). Adapter required for use with 220-240V.