WHAT IT CAN DO-- With the countdown function, you can set a certain time to turn off home appliances, improve your home security and make your life easier and safer PREVEN OVERCHARGE-- When the battery is fully charged, it will automatically disconnect the circuit, effectively preventing electronic equipment from overcharging. Very suitable for home lighting, fans, air conditioners, humidifiers, Christmas trees ect WIDELY APPLICATIONS-- Timer power outlet switch widely used at home, hospital, school, etc. Which can save energy and cost, reduce fire hazard and extend the life of electrical appliances 6-MODE TIMER OPTIONAL-- 6 Different countdown settings can be set freely to meet your different needs, all you need to do is plug the product into a power outlet, then choose the setting you want MULTIPLE FUNCTION-- This product is a countdown timer and simultaneously measures power consumption, voltage, current, timing of electrical appliances as multi-function sockets