Azden Wlx-pro/630 VHF Lapel & Mini Headset Wireless System for Camera Receiver type: Double superheterodyne Transmitter Modulation system: FM Battery: 9V (Not Included) Receiver Dimension : 86(h) x 60(w) x 21.5(d) mm (3.3 x 2.4 x 0.85) Transmitter Dimension : 86(h) x 60(w) x 21.5(d) mm (3.3 x 2.4 x 0.85)