The BOYA BY-M1DM is a Dual Lavalier Universal Microphone with a single 1/8 stereo connector it can be used with smartphones DSLR cameras camcorders audio recorders PC and other recording deceives. It consists of two of the well-received omni-directional lavalier microphones and 4m (13ft) length cable it s perfect for interviews presentations podcasts webcasts or any situation where more than one subject needs to be recorded. Its 4m cable provides 2.8m of distance between each microphone for comfortable placement while the included tie clips allow for hands-free use. Feature: Wide of Compatibility: Compatible for smartphones cameras camcorders audio recorders tablets and other audio/video recording devices. Omni-directional Polar Pattern: The omni-directional polar pattern provides excellent off- response even if a subject turns their head while speaking. Designed for Recording Interviews: Excellent for interviews the dual omni-directional lavalier microphones can record two sound resources at the same time. Improved sensitivity and signal-to-noise. 4m(13ft) length cable allows you to use in various situation. Rugged Metal Power Pack. Includes carrying pouch. Specifications: Brand: BOYA Model: BY-M1DM Transducer: Electret Condenser Polar Pattern: Omni-directional Frequency : 65Hz~18KHz Signal / Noise: 74dB SPL Sensitivity: -30dB±3dB / 0dB=1V/Pa 1kHz Output Impedance: 1000 Ohm or less Connector: 3.5mm (1/8 ) 4-pole gold plug Power Requirement: LR44 (included) Cable Length: 4m / 13ft Item Weight: 68g / 2.4oz Package Size: 13.2 * 9.2 * 4cm / 5.2 * 3.6 * 1.6in Package Weight: 122g / 4.3oz Package List: 1 * BY-M1DM Lavalier Microphone 2 * Foam Wind Screen 2 * Clothing Clip 1 * 3.5mm to 6.35mm Audio Connector 1 * LR44 Battery 1 * Carry Pouch 1 * User Manual (English) Note: Not all cameras have a microphone input. Verify this with your camera manufacturer. Many cameras have headphone remote control and other ports that look similar to a microphone input. Make sure that you are using the correct one. No need to install battery when using the microphone with a smartphone or a laptop. Install battery in right polarities when using the microphone with a camera or other devices (audio recorder amplifier etc.).