D29 Specifications
* SPK: Φ40mm Mylar speaker
* Impedance: 32Ω±15%Ohm
* Sensitivity: 104±3dB/mW
* Effective Freq.Band: 20∽20KHz
* Rated input power: 10mW
* Max.input power: 15mW
* Mic Type:Ф9mm x 7mm
* Impedance:maximum2.2KΩ
* Sensitivity:-50db±5db (0db=1v/pa)
* Directivity:omnidirectional
* S/N Ratio: More than 60db
* Current Consumption: Max 0.5ma
* Standard Operation Voltage:4.5V
* Sensitivity Reduction:＜-3db at 1.5V
* Frequency Range: 100Hz- 16,KHz
* Plug Type: Ф3.5mm stereo
* cord length: about 2M
* net weight:
* gross weight: