JJC Wireless AC Flash Trigger JF-220U is the professional choice for reliable wireless flash triggering. It works at a universal 433MHz wireless signal with 16 channels available to free of interference. The fastest sync speed is 1/250 sec. It can trigger the flash at a distance up to 30m. What’s more, the receiver can work under a voltage from 80V to 240V, makes it a universal wireless trigger. Three components are included in this trigger unit, a transmitter, a receiver and a 3.5mm to 6.35mm receiver adapter plug. The transmitter is to be attached on the hot shoe of the camera while the receiver is to be plugged into the studio flash. With the wireless flash trigger, you can place the studio flash at different angles and distances from the object.