FeaturesLavalier dual microphoneAdapter for DSLR, recorder, PA system, voice amplifier or mixerOmni-directional with Electret condenserFrequency range: 65Hz ~ 18KHzAudio cable: 6mThe Maono Lavalier Dual Head Electret Condenser Omnidirectional 3.5mm 4 Pole Jack Tie-Clip On Lapel Microphone features two microphones, an active/passive controller, 3.5mm 4-pin jack for PC, laptop, smartphones, 6.5mm adapter for professional devices: DSLR, recorder, PA system, voice amplifier or mixer. What\'s more, the dual lavalier microphone comes with a nice, long 236 inches cord for any occasion: interview/ chat/ presentation/ speech/ live/ recording/ event/ project/ teaching/ tour guide/ party/ church/ wedding/ festival/ musical instrument/ phone call etcTwo batteries are included for the microphone. One is already installed and, if you run out of the battery, you can use the spared one inside the package. \"OFF\" is for smartphone mode; ON\" is for DSLR camera mode. Please make sure to use the right mode to match your device. It\'s normal that noise might happen when plugging a microphone into a camera in auto volume mode. Don\'t worry, just decrease the volume a bit and it will eliminate the noise. The 3.5mm TRRS jack is compatible with computers, Apple products, Android & Windows smartphones. What surprise is one more 6.5mm adapter is included, ideal for those who use DSLR cameras, headset, and professional audio devices. More advanced configuration and 236 inches/20ft long cord help to record loud and crisp sound when interviewing, live broadcasting on a podcast, calling with Skype, teaching, audio/video recording on YouTube and so on. A Mini metal clip allows you to easily clip it to your collar, tie or pocket.FeaturesTransducer type: Electret Condenser x 2 pcsPolar Pattern: Omni-directionalFrequency Range: 65Hz ~ 18KHzSignal / Noise: 74dB SPLSensitivity: -30dB +/-3dB / 0dB=1V/Pa, 1kHzOutput Impedance: 1000 Ohm or lessOutput Connection: 3.5mm (1/8 inch) 4-pole gold plugBattery Type: LR44(Included)Dimension: Microphone:18.00mmH x 8.30mmW x 8.30mmDAudio Cable: 6.00m