Features: This wireless trigger is control discreteness for camera to trigger hot shoe flashgun synchronously. Easy installation, low power consumption No any damage to camera. High-speed and synchronous for 1/200 second. Max. working distance: 30M (open area, without interference). 16 channels to avoid interference. The receiver has an on/off switch, and an LED to indicate triggering. New design: Channel Selector outside the transmitter and the receiver. Specifications: Wireless Flash Trigger. 16 channels selectable. Power Input of Transmitter: 23A 12V battery (included). Power Input of Receiver: 2 AAA batteries. Long lifetime of trigger battery, one year or over 20,000 continuously triggers. Plug size of receiver: 3.5mm. Adapter size for receiver plug: 3.5mm --> 6.35mm. PC sync cable included. Radio working frequency: 433MHz. How to use: Make sure the channel selector of both transmitter and receiver at same position. Insert the receiver's trigger output plug into your flash's jack. Press the test button on your transmitter. The studio light should now flash. Insert the transmitter's hot shoe socket into your camera's hot shoe jack (if your camera does not have a hot shoe use a PC sync cord and insert into the socket). You should now be ready to start shooting (you can use the 3.5mm sync cable for cameras without hotshoe or hotshoe is engaged). Package Contents: 1x Trigger. 1x Receiver.