Features: [Automatic Pairing] After the earphone is paired for the first time, it will automatically start up and connect to phone when taken out the charging bin again, fast and convenient. [HD Audio] Adopting CVC 8.0 noise reduction technology, F9-3 delivers clear sound quality in binaural connection without ambient noise. [Innovative Design] The charging box is equipped with a bottom light. Long press the switch key to turn on the strong LED, which can illuminate the night. [Convenient Charging Box] The rechargeable charging box can be used as a power bank to charge the mobile phone for emergency. [LED display] LED-digital screen shows clearly the battery charging status and remaining power of left and right earphones as well as charging case. [Colorful Fingerprint-Touch] With smart touch-control, different complicated operations can be done easily, such as volume and music playback control, Siri summoning, etc. [Compact Size] It is small and portable, fitting well your pocket or backpack, easy to carry and store. Enjoy music at anytime and anywhere. [Universal Compatibility] F9-3 is widely compatible with iOS and Android systems.