RF remote control transmitter & receiver model of 0020034 (S4C-DC091224 & C-4) includes one 4-button remote transmitter and one 4-channel receiver. Each remote button controls each channel of receiver on and off. It can be used to control at most 4 same or different on off electrical devices. Remote distance up to 100m. It is widely applied for remote controlling on off electrical devices such as lights, fans, electric door locks, etc.