Azden WHX-PRO VHF Camera-Mount Wireless Cardioid Handheld Microphone System (169 & 170 MHz) With Extra Transmitter. Please Look at Photos Closely as they are part of the description and are of the actual item you will receive. The Azden WHX-PRO VHF Camera-Mount Wireless Cardioid Handheld Microphone System is a cost-effective audio solution designed to help vloggers and content creators improve the audio quality in DSLR- or mirrorless-camera video productions. The system offers a range of 250' and two selectable VHF frequencies, which provides an option in case of signal interference. The receiver's output plugs right into the audio input on your camera using the supplied cable.The transmitter runs on a AA battery and the receiver on a 9V for up to 8 hours of shooting time. The receiver includes a shoe-mount and a hook-and-loop tape to mount and fasten it to your camera. It also comes with a headphone jack and earphone for real-time monitoring. Up to two WHX-PRO wireless systems can be operated simultaneously on set.