Product Name : Boya BY MM1 Cardioid Microphone.

Features
Compact on-camera microphone
Compatible with smartphones, DSLR cameras, Consumer Camcorders, PCs etc.
Rugged metal construction
No battery required
Professional furry windshield included
Specifications
Transducer: Electret Condenser
Polar pattern: Cardioid
Frequency Response: 35-18KHz +/-3dB
Sensitivity: -42dB +/- 1dB / 0dB=1V/Pa, 1kHz
Signal to Noise Ratio: 76dB SPL
Plug: 3.5mm TRS and TRRS connector
Dimensions: Φ22*81mm
Net Weight: 86g/0.19 lb