The JF-U series 3-in-1 Wireless Flash Trigger & Remote Control is a versatile, reliable remote control kit that will trigger off-camera flash units and studio lights from up to 30meters / 100 feet away. The JF-U series also provides the convenience of a wireless camera shutter release, ideal for photographing wildlife, and also for macro and close-up photos, where the slightest camera movement can ruin a picture. Working on the 433MHz frequency gives you reduced radio interference and an extended range (up to 30meters/100feet) - you dont need to have line-of-sight alignment, either, as radio waves will pass through walls, windows and floors PRODUCT FEATURES : Frequency : 433 MHZ Control range : 30 m/100 feet 16 Channels Synchronous Speed : 1/250 s TX Power : 1 x 23 a Battery RX Power : 2 x AAA Batteries