The Westcott FJ-XR Wireless Receiver is a compact and user-friendly device from Westcott that enables FJ-X2m and FJ400 users to connect additional strobes or flash units to their setup. It uses a 2.4 GHz frequency and connects to the 3.5mm sync port of compatible strobe or flash units. This eliminates the need for wired and optical sensor communication. The Westcott FJ-XR Wireless Receiver has a built-in lithium-ion battery that can be recharged via a standard USB-C connector. This wireless receiver is an ideal accessory for photographers who want to expand their lighting options and improve their workflow.