sinkingdom automatic vacuum switch for dust collector, delay on/off electrical outlet switches, eliminating circuit breaker tripping sk50a sinkingdom sinkingdom automatic vacuum switch for power tools, delay on/off electrical outlet switches, eliminating circuit breaker tripping sk50a automatic turn on the vacuum when you start your tool , and delays 7 seconds to turn off the vacuum to clean the pipe when you complete your work. saving time and electricity, reducing airboin toxin and noise that may lead the health problem. max. motor rating should not exceed 120v, 15a,60hz, 1875w. how to use 1.connect the power of automatic vacuum switch. 2.insert the electrical tool to the socket labelled tool. 3.insert the vacuum cleaner or work lamp to connect to the vac socket. 4.the electrical appliance inserted in the vac socket must be kept at the on status. 5.when the electrical tool is switched on, the vacuum cleaner or electrical appliance connected to vac will switch on immediately. 6.when the electrical appliance inserted in the tool socket is switched off, the electrical appliance connected to the vac socket will continue to operate for 10 seconds and then stop. package included: ●1x vacuum switch with 15'' power cord ●1x installation instruction