1,Power switch for range hood 2,life long:more than 100000 times ... ,Power switch for range hood2,life long:more than 100000 times3,CE,DVE,RoHS certificate4,button cap can deside by yoursFunction:four speed( speed ... low,speed middle,speed high,speed extra),reset,lighting220V or 110V inputcan control 3-4 speed motor Power switch for range hood