The Mini Slave DC Flash with PC from Impact is a DC flash unit that is a good choice to add dimension to photos done with built-in flash cameras or for use as a small light source for single subjects or small groups. It can be used as a main flash when connected to your camera's PC outlet with the included coiled cord, or as a master flash to trigger other slave flashes. Thanks to its optical sensor, it can also be positioned and triggered from the camera position up to 33 feet away. Beveled sides allow you to tilt the Mini Slave in the direction of your subject or you can mount it to a stand or other accessory via its 1/4"-20 socket. The Mini Slave gets 260 flashes from a fresh set of 2 AA batteries.