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🎧FEATURES:🎧 These Bluetooth earphones reduce noise level to about 19 dB using Bluetooth 5.0 and CVC 8.0 intelligent noise reduction technology Built-in 2000mAh capacity battery gives a backup of about 120H for listening music and about 150H for phone call. Intelligent LED display, more intuitive , Smaller size, easy to carry, more portable and beautiful, and more complete functions.📝INSTRUCTIONS:📝 Remove earbuds from charging case and a blue light will indicate that they are automatically turned on. Or press the earbuds for 3 seconds, blue indicator light flashes which tells that the earbuds are on. Turn Bluetooth of your mobile device on and search for "F9". Pair and connect.How to Re-Sync Earbuds? For ease of distinction hold L earbud with left hand and R earbud on right hand. Turn on the earbuds and hold the button on both earbuds for 10 seconds at the same time. The LED will flash red/blue and after the 10 sec will flash only blue, let go of the earbuds and Quickly tap the Right Earbud 2 times, Earbuds will continue blinking until one of the earbuds will turn off, it's normal, the other one will continue flashing red/blue. Go to your device's Bluetooth setting and "F9 or Headset" should show up only once instead of 2 times separately. Repeat steps 2&3 if "F9 or headset" shows up separately again, sometimes it takes a couple of tries for the devices to completely re-sync. Connect your earbuds now and both will be fully paired. NOTE:The charging box is not waterproof