【TWS & BLUETOOTH 5. 0】Adopt the most advanced Bluetooth 5. 0 technology. Mailink T9S Support SPP, HFP, A2DP, AVRCP. Provides in-call stereo sound. Also own fast and stable transmission without tangling. 【AUTOMATIC PAIRING & NO MASTER-SLAVE RESTRICTION】Open the charging case, the earbuds will turn on and pairing each other automatically. Then "T9S " will automatically appear on your mobile phone. No master-slave restriction, No manual setup, no waiting, no skills! With few seconds, you will be in your wonderful music world. 【Breathtaking music quality】The unique stereo sound quality and design gives you the perfect sound, and you can feel the more realistic music. Crystal clarity and Deep, resonant bass with delicately tuned sound signature deliver immersive sound and put you on the stage center. Also combined its CVC 8. 0 noise reduction functionality, you’ll experience a whole new world of crystal-clear phone calls. 【24 hours playtime & Portable charging box】The earbuds can enjoy up to 4 hours of premium quality talk/play time after each charge for 1 hour. The charging box can charge the twin earplugs 5-6 times. Very small lying in your ear, the portable charging box is suitable for your trouser pocket (44)