1 yellow LED for roof mounting. To suit 1.10 scale models car or truck shells. Simple 2 LED lighting system. Recommended to be used with lighting buckets sold separately. Simple on off switch. This set would be powered by any 27mhz 35mhz 40mhz amd or fm or 2.4ghz receiver which must be running by an esc or have a 6v DC input if using two servos for nitro models.