The Fj-xr Wireless Receiver connects to any strobe or flash with a 3.5mm sync port for basic communication with the Fj-X2m Wireless Trigger. Designed with a built-in, rechargeable Lithium-Ion battery, the Fj-xr is equipped with a simple 3-button design, easy-to-navigate user interface, and hinged 3.5mm sync plug. Simply select the desired group and channel to extend your lighting setup..