Features: Back electret condenser microphone, adopt X-Y stereo sound pickup technology, accurately capture sound localization for clear and stable recording effect. With +20dB, odB and -10dB sensitivity switch, support up to 15m pick-up distance. Built-in low-cut filter switch, effectively reduce low frequency ambient noise, comes with a wind cap. RFI shielding technology, greatly decrease mobile phone signal interference. Shockproof design can reduce the mechanical noise to a large extent. Use standard ?3.5mm mini stereo connector, well fit for most cameras, DV and camcorders, standard hot shoe mount for secure and easy installation. Powered by CR2032 button battery, can offer up to 50h service time, with low power warning indicator. Made of aluminum alloy, anode oxidation surface treatment for anti-scratch and fine workmanship. Ideal for outdoor photography and news interview.