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The Speedotron 4 Channel Radio Wireless Transmitter is a great way to eliminate that tangle of potentially hazardous PC cords and trigger your remote flash unit from the camera. The Transmitter features 4 channels to minimize interference, LED indicator, a hot shoe mount for your camera and a sync cord outlet. It runs on one A23 (12V) battery (purchased separately). The 4 Channel Radio Wireless Transmitter has a sync voltage of 4.5V, making it safe to use on any digital camera.