12V 15A DRY CONTACT 10-minutes AUTO SHUTOFF RELAY SWITCH
universal multi-purpose auto shutoff timer DRY contact relay switch works with most 12v powered device applications.

how does it work?
when relay is on (close), it will began count down, when it reached 0(±1) second, relay turns off (open)

there are 2 different hookup option, see connection diagram in photo section.

Specs:

Kit included: 1 switch receiver box, 2 water resistant remote control key fobs, included battery
Physical dimension:

remote  2-1/4" x 1-3/16" x 7/16"

receiver box 2" x 1-7/8"  x 1"
Remote range: ~80ft

(remote range and signal strength varies depend on how device is setup, battery strength, interference, etc..)

power input: 12V DC with minimum 500mA 
relay output: 12V DC

max. relay current: 15A
standby current: 4.5mA

operating temp: 0~135f