1.This product is suitable for home appliance, and office ect . 2.Sound category:Single dingdong,Double dingdong,West minister, 12 melodies,and others 3Sender:DC9V(6F22)/DC12V 23A 4.receiver:DC3V(1.5V AA*2) 5.Frequency:433.92MHz 6.Remote control distance >=30m 7.One sender can control one or more receive