Look, no wires!

Wireless transmitters enable you to trigger your Speedlight from any position you like. They allow much more freedom than sync cables, and are more reliable than optical slaves. They typically feature a transmitter that attaches to your camera’s hotshoe, and a receiver that goes on the flash. You can usually set a channel so that the transmitter and receiver recognise one another without interference from similar devices. The more expensive triggers like Pocket Wizards offer extra control and features like through-the-lens (TTL) metering, which enables auto exposure, whereas the more basic models like the Hähnel trigger used here require you to set the flash power manually.