Model: BOYA BY-M1DMClip-on lapel microphone for Smartphones, cameras, camcorders, audio recorders Omni-directional Condenser Microphone Excellent for interviews Each Mic Routes to Discrete Channel Improved Sensitivity and Signal-to-Noise Includes carrying pouch Transducer: Electret Condenser Polar pattern: Omni-directional Frequency Range: 65Hz ~ 18KHzSignal / Noise: 74dB SPL Sensitivity: -30dB +/- 3dB / 0dB=1V/Pa, 1kHzOutput Impedance:1000 Ohm or less Connector: 3.5mm (1/8”) 4-pole gold plug Power requirement: LR44 (included)Cable length: 4m(13ft)chainaM1DM Dual Microphone Boya Professional Microphone For Mobile & Dslr BOYA M1DM