The RPS Studio Wireless Release for Canon EOS Digital SLR cameras is a radio remote control with a range up 100ft. The compact transmitter with telescopic antenna is powered by a small 23A 12V battery. The transmitter has 4 dip switches and can be adjusted up to 16 channel setting. There is a two-color LED light on the unit to indicate focus mode and shutter release mode. The receiver also features a 2.5mm jack which fits into the camera's remote control socket. It has 4 dip switches and 16 channel combinations to match the transmitter. The LED on the receiver is the same for the transmitter, with a green and red light flash corresponding to the transmitter.