Audio Technica
Model Number: AT9904
Style: Lavalier Microphone
Transducer: Condenser Microphone
Use: Conference Microphone
Set Type: Single Microphone
Polar Patterns: Omnidirectional
Communication: Wired

Descriptions
AT9904 subminiature omnidirectional microphone is engineered for intelligible, accurate voice reproduction. Its low-profile design minimum visibility. The mic may be worn as a lavalier and is easily hidden in clothing or hair. 
 
Features
 High-quality ultra-small mono microphone corresponding to digital recorder;
Power supply design for plug-in power module that does not require batteries;
Plug in power is powered by the microphone terminal of the connected device.
With 3-pole mini plug, it can also be used on computer;
Cannot be used on some computers such as Mac.
It adopts dual-purpose fixing clips, which can be installed and set according to the usage;
Turn the clip part, it can be worn on clothes or set on the table.
Solid, beautiful metal body that can reduce external noise.
Windshield with the effect of reducing wind noise and other noises.
 
Specifications
Components: Mono capacitive radio head
Directivity: omnidirectional directivity
Frequency response: 30~18,000 Hz
Sensitivity: -42 dB (7.9 mV) at 1V at 1 Pa
Impedance: 1,500 ohms
Power supply: plug in power supply
Size: Diameter 6.4 mm x 18mm
Weight: 1g
Lead wire: 1.2 m