It is a Dual Universal Microphone, with a 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 microphones and 4m (13ft) length cable, it's perfect for interviews, presentations, podcasts, webcasts, or any situation where more than 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 off- response, even if a subject turns their head while speaking.
Designed for Recording Interviews: for interviews, the dual omni-directional microphones can record two sound resources at the same .
Improved sensitivity and signal-to-noise. 4m(13ft) length cable allows you to use in various situation.
Rugged Metal . Includes carrying pouch.

Specifications:
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-
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: D5707
1 * BY-M1DM Microphone
2 * Foam Wind Screen
2 * Clothing Clip
1 * 3.5mm to 6.35mm Audio Connector
1 * LR44
1 * Carry Pouch
1 * User Manual (English)

Note:
Not all cameras have a microphone input. Verify this with your manufacturer. cameras have headphone, , and other ports that similar to a microphone input. Make sure that you are using the correct .
No need to install when using the microphone with a smartphone or a laptop. Install in right polarities when using the microphone with a or other devices (audio recorder, , etc.).