This Dot-Line RS-RT04/S RPS Wireless Shutter Release is a wireless RF (radio frequency) remote that consists of two parts; a receiver/trigger that connects to the camera's cable release socket, and a separate transmitter. The remote can have a range of up to 100' (30.5 m) under optimal conditions, and it features a two-position switch for focusing operation or shutter release. The RS-RT04/S is equipped to provide 16 different user-selectable channels.
Note: The receiver takes 2 "AAA" batteries (not included)
May be used on up to 16 channels...user settable.
Eliminates the need for a cable release.
Transmitter has a 2 position switch...press lightly for prefocusing, and then continue pressing to release the shutter.