VOLT PLUS TECH Wireless V5.0 Bluetooth Earbuds Works for Samsung Galaxy S21+ 5G/Plus/Ultra with LED Display, Mic, 8D Bass, F9 TWS IPX7 Waterproof/Sweatproof with 2000mAh PowerBank Charging case

        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