Sennheiser EKP AVX-4-US Plug-On Receiver for AVX WirelessThe EKP AVX is the receiver for the AVX wireless microphone system. It features self configuring digital transmission which eliminates time consuming radio frequency setup. The ultra compact receiver rotates around the XLR connector to avoid collision with other devices mounted on your camera. It switches on and off automatically with your camera saving battery power. The AVX matches perfectly to your camera's input sensitivity without having to