This Wireless RF (Radio Frequency) Shutter Release Kit enables you to release the shutter in both wireless and wired modes. The system produces a coded radio signal that works indoors, outdoors, around corners even through walls. It has an effective working range of up to 100 ft. RF Kit also provides 16 multi-coded channels, giving the photographer plenty of combinations to work with, without jamming the frequency. To use the RF kit wireless, simply attach the receiver (Blue LED Indicator will blink to indicate receiver is on) to the camera, then use the transmitter to trigger the shutter release. Using the RF kit wired is easily done by attaching the receiver onto the camera, then press the shutter release button located on the receiver. The cord on the receiver is approx. 3ft in length, allowing for ample mobility for photographer positioning. In both wired and wireless modes, press the shutter release halfway to activate auto focus (Red LED indicator will come on to confirm on receiver), then press button fully to take a picture. High quality and durable design make this Wireless RF Shutter Release Kit stand out amongst the competition of inexpensive and mediocre kits. The receiver can be conveniently mounted on top of your camera (You don't have to, if you need to mount the flash)