Sony SMAD-P3 Multi-Interface Shoe Adapter for Cable Free Connection Sony SMAD-P3 Multi-Interface Shoe Adapter - Sony 90 Day Limited Warranty Completely cable-free operation, allows simple and effective shooting without the need for external cables connecting the wireless receiver to the camera Transfer of audio signals from the receiver to the camera through the Multi-Interface connector Allows for feeding power from the camera to the receiver via settings on the receiver Power supply automatically switches to power from the camera when batteries are not inserted in the receiver. The camera on/off switch controls the receiver's power