Specification:
Driver: 10.5mm CCAW dynamic
Impedance: 24ohm +/- 15%
Sensitivity: ≥103dB (@ 500Hz)
Frequency Response: 20Hz- 20kHz
Channel Balance: ≤3dB @ 500Hz
Distortion: ≤2% @ 105dB
Rated Power: 10mW
Maximum Input Power: 30mW
Plug: 3.5mm 24K gold plated stereo plug
Cable: 1.25M PET cable, 4X14 core 6N OFHC Copper wire
Reviews:
Clieo from Inearmatters.net:
“The great strength of GR99 is perhaps its lack of real weakness.”

Awarded the sonic diamond award for outstanding price/performance ratio
ljokerl from Head-fi.org:
“The GR99 is yet another heavyweight offering from VSonic, this time in the bargain sub-$30 category. ”
Awarded 10/10 for the best in value