1) interchangeable ear-buds
   3-size inter-changeable silicone ear-buds (S，M，L). Choose the size that's right for your ears.

2) metallic ear drum
   Metallic ear drum housing earphone reproduces near distortion free music and voice.

3) multi-functional control
   Performs 3 functions:
   - microphone inlet for voice conversation
   - volume +/-
   - on/off

4) gold-plated 3.5mm jack
   Work with any devices with 3.5mm jack like MP3 player， handphone， PC & laptop