For BOYA BY-M1DM is an Omni directional lavalier Dual-Head microphone, designed for Smartphones, DSLR, Camcorders, Audio recorders PC etc, it is perfect for video use.
With Omni pickup pattern, for full 360° coverage, it absolutely gives you the possibility to capture anything in your sight.
Moreover, the integrated 6-meter (20) cable with 3.5mm 4-pole gold plug is just a second thing to be connected to your smartphones and most of your cameras.
Super sound for presentations and video audio recorders Lavalier Clip-on Omnidirectional Condenser Microphone is designed for video use and provides clear and accurate voice reproduction.
Newscaster-style design provides effective omni-directional pickup pattern.
This is the best performance+cost value available for your complete video needs.

Features:
Clip-on lapel microphone for Smartphones, cameras, camcorders, audio recorders, tablets,and other audio/video recording devices
Omni-directional Condenser Microphone
Excellent for interviews
Each Mic Routes to Discrete Channel
Improved Sensitivity and Signal-to-Noise
Includes carrying pouch

Using the microphone:
For Smartphone
Switch off the microphone. Slide the ON/OFF up to OFF/Smartphone.
The power is shut down.
For DSLR, Camcorders, Audio recorders, PC
Switch on the microphone. Slide the ON/OFF up to ON.

Specifications:
Transducer type: Electret Condenser
Polar Pattern: Omni-directional
Frequency Range: 65Hz ~ 18KHz
Signal / Noise: 74dB SPL
Sensitivity: -30dB +/-3dB / 0dB=1V/Pa, 1kHz
Output Impedance: 1000 Ohm or less
Output Connection: 3.5mm (1/8¡±) 4-pole gold plug
Battery Type: LR44 (Included)
Microphone: 0.7x0.3x0.3 inch (18.00x 8.30 x 8.30mm)
Audio Cable: 20ft (6.00m)

Package Includes:
1 * BY-M1DM Microphone
1 * Lapel Clip
1 * Foam Windscreen
1 * Adapter
1 * User Manual (English)