AZDEN CAM-3 On-Camcorder Mini Audio Mixer Attach To Camcorder Or Hand strap; Does Not Require Batteries Dim: 3.25"l X 2.13"w X .25"h; Weight: 3 Oz 3-channel Microphone Mixer Mix sound as you shoot from 3 external mics Attached to camcorder or hand-strap 3 1?4" x 2 1?8", weighs 3 ounces No batteries required