Features:

The BOYA BY-VM01 mini microphone is designed for recording audio while making video.
Fixing cushioned anti-vibration.
Reduces vibration noise during auto focus.
Windshield allows to reduce noise.
Connect to the camera via the 3.5mm mini-plug.
Built-in hot shoe mount with 1/4” thread.
The microphone base fits with almost camera camcorder.
Power by one 1.5V AAA battery (not included).

Specifications:
Type: Condenser microphone (directional)
Frequency Response: 38-20,000Hz
Sensitivity: 40dB /- 3dB / 0dB=1V/Pa, 1kHz
Signal to Noise Ratio: 75dB or more
Output Impedance: 1.0k Ohm or less
Power: 1.5V AAA battery (not included)
Plug: mini-pin plug (3.5mm)
Package size: 16.7 * 11.8 * 7cm / 6.6 * 4.6 * 2.8in
Package weight: 176g / 6.2oz