12v Wireless Remote Switch,DC12V/24V/48V/72V/40A Relay with 4900FT Long Range…
(Note:max load:30A). A: First, look at how many volts your device is. 1 x Remote Switch(with antenna). Cable length of antenna: 3m. Battery model: alkaline 12V 23A. It only needs to be connected to the circuit, without complicated settings.