The Dot Line RS-RT06/S Deluxe Digital Wireless Shutter Release is designed for Sony Alpha Series DSLRs. It allows the camera to be fired from distances up to 150' (45.7 m) away. The RS-RT06/S uses RF (radio frequency) signals, not line-of-sight like infrared triggers. The transmitter has a 2 position switch...press lightly for pre-focusing, and then continue pressing to release the shutter.
This wireless shutter release has a digital display to indicate the channel selected. It may be used on up to 4 channels. To set channels, just press a button...no dip switches to set.