1. It adapt hi-stereo speaker, could let you enjoy authentic music, don't tired your ears for long time.

2. We use silica gel earpiece, also let your ears comfortable when listen.

3. Special shell design:

(1) could to tie necklace to hang upon neck.

(2) could to tie elastic to combine the MP3 and earphone together.

(3) could print the logo and mark on it.

(4) equip a limpid lens to put in mark and DIY personal photo.

4. The cost lowest than wireless and reduce the usage of radiated products, and to avoid harm of electromagnetic wave, another it could solve the trouble of clean cable of wired products, it is quickly clean and collect, and convenient to carry with you.

5. “Unilateral Retractable Device”, it have got formal patent license at this unilateral retractable device, selling in USA, Europe and Japan now.

6. Be changed the surface by customer’s design for different selling area and brand.

7. The unilateral retractable device could be apply to your products, to increase your function and added value and diverseness between others. it is fit in with diversification and distinction of your promoting.