Beteran TTPOD T1E T1-E Enhanced Super Deep Bass Quad-Core High Fidelity Definition Dual Dynamic Professional HIFI Studio DJ Stereo Music MP3 MP4 Mobile Phone Music Player DVD In-Ear 3.5mm Earphones Headphones Earbuds (Gray) Conducted on the basis of T1 perfectly balanced version optimized for the preparation of more popular genre with the big tracks IF warmer, deeper distant low-frequency sound field more ambitious Unit optimization:Coil diameter increased by 6.8%, double the number to four winding wound, IF fuller, more powerful low frequency Diaphragm optimization: The latest generation of the German original biological membrane, sound density stronger, more adequate amount of information High-quality synthetic material housing: Lightweight high-strength, durable, comfortable to wear 6 times harsh test: The difference between left and right channels is less than 1DB, top international quality standard headset