Advanced in-ear speaker design
All metal housing
Low mass， ultra-wide bandwidth driver for superior accuracy
Pro sound isolating ear tips
Micro strand connector
Magnetic flux tube
Ruduce tangles during storage
Suitable for MID， MP3， MP4， CD， smart phone， radio， audio class computers and related products

Note:
Please use the CD to burn headphone to get the best sound quality
Recommended frequency is 20Hz to 100Hz in stereo channel and keep working for about 8 hours