Azden 310UDR On-Camera Receiver: * Includes: 305UDR On-Camera Receiver, 305UDR On-Camera Receiver, 35HT Handheld Microphone/Transmitter and 35XT Plug-In Transmitter * Headphone output on receiver * Attached/removable shoe-mount * Powered by 2 AA batteries (not included) * 188 selectable UHF frequencies * New, pivoting high-gain antenna * Digital LCD display with multifunction readout