XLR Adapter - ideal for the Canon EOS 5D Mark II or EOS 7D.With headphone socket. Two balanced XLR inputs. Switchable mic or line level inputs. Built-in level meter. Also features Auto Gain Control Disable, which gives better user-control over camera's audio recording levels. Please note - you will need a self-powered mic with this unit - it does not supply phantom power. (9v battery - not included)