NORMALLY-CLOSED RELAY: initially relay is in "closed" position and circuit is connected. when remote button is depressed, relay will then opens up and circuit will be disconnected. this operation will cycle each time remote control button is depressed.

Best for use in situation where you want your circuit stays connected at all time but occasionally be able to turn it off, remotely. 

For remotely turn off and on 12V DC application uses in automobile, motorcycle, boat, RV, boat, home, garden, hunting tool and any 12V device

receiver comes with wires for easy installation.

Specs:
Kit included: 1 switch receiver box, 1 long range remote transmitter (battery included)
Remote mode: on and off, toggle mode
Remote range: ~500ft

(Remote range and signal strength depend on where device is setup, battery strength, interference, etc.)
Receiver Input: 12V DC only 
Receiver output:12V DC 
Relay standby state: normally closed
Maximum load: 15A

Operate Temp: 0F~135F