The kit contains a battery powered clip-on light that is surprisingly bright, the on/off switch is here:
It uses 2 AAA batteries stored in the battery compartment accessed on the back of the light:
Clip-On Light
The kit contains a battery powered clip-on light that is surprisingly bright, the on/off switch is here:
It uses 2 AAA batteries stored in the battery compartment accessed on the back of the light:
Global iPhone Broadcast Kit 