F9-8 Up-graded Bluetooth 5.1 Wireless headphones Touch Control with 2000mAh Charging box IPX7 Waterproof of Hifi Stereo Headsets in-ear Built-in Mic Earphones Premium Sound♫【Balanced,Immersive Sound】:wireless earbuds with the built-in high-quality audio chip，deliver Hi-fi sound quality, achieving the sound of the immersive music scene surround sound.♫【Battery LED Display】:The bluetooth earphone in ear of the new model has a Battery LED display function .By touching the button you can easily read the power of the box, without worrying about the power outage of the box. one-button operation, play pause, answer hang up, summon Siri, switch songs.♫【Waterproof & Ergonomical Design】:waterproof level can easily resist sweat and water, and you don't have to worry even if it rains.Equipped with three different sizes of soft silicone ear tips (S, M, L), These sport headphones are very suitable for outdoor sports, workouts whole day, just enjoy yourself !♫【True Wireless Earbuds with Box】 : Mini box and easy to carry, true wireless connection and charging.Mini box can do mobile phone bracket (The box has a USB interface to your other devices urgently)♫[Customer Experience] :We check products at every level before out of storage. If you encounter any problems, please contact us in time, because we focus on providing each customer good shopping experience.Please follow the above steps. If you have done it wrong  there is only one headset with sound.First put the headset back into the headset case, if your phone has been connected to the headset before, delete the connected Bluetooth nameTake out two earphones at the same time, please give it time to pair  if the pairing is successful, only one earphone has lightAfter the two headsets are paired successfully, turn on the Bluetooth of the mobile phone to searchTechnical specification:5.1 + EDR Bluetooth Specification:Noise Reduction: cvc8.0 Transmission Distance: 33ft Frequency response: 20 - 22 kHz Capacity: Charging Case 2000mAh / Earbuds 65mAh Music Time: 120 hoursTalk time: 150 hours Loading Port: USB Charging Time: 25 minutesPlayback Time: up to 4 hoursStandby time: 630 hours1.Innovative TechnologyBuilt-in powerful Bluetooth 5.1 chip, CVC8.0 noise reduction2.Touch upgradeFingerprint touch without pressingNo button control brings uncomfortable pressure to your ears and relieves more pressure on your ears。Answer and hang up the call/play pause operation/volume adjustment/up and down song switching/Siri voice wake-up3.Upgrade the Bluetooth chip, fast connection, stable connectionBluetooth 5.1, barrier-free connection within 10 meters, smooth music/games/movies/calls without delay, stable and continuous connection4.Siri voice assistant Tap to callWake up Siri with one button and have a good chat with your favorite voice assistant. Whether you want Siri to help send messages, set a timer, or act as your personal DJ, just speak up.5.Two connection methods can be used at willTwo earphones can be connected to the same mobile phone at the same time, or a single earphone can be connected andused, which is equivalent to two independent earphones6.All Bluetooth can be connected, powerful and compatibleHigh compatibility, as long as there is Bluetooth, you can connect, support mobile phones, computers, tablets, notebooks, etc.Q&A Small TheaterQ: One Bluetooth headset does not workA:1. Check whether the set mono output can be adjusted to dual ear canals. 2. Check if one of the headphones has lost its pairing after a dead battery. 3. Check whether the two headsets are connected to two devices. You can turn off the connection between the phone and the headset, and delete the Bluetooth headset from the Bluetooth list of the phone. Re-pair the mobile phone and the Bluetooth headset and play the audio againQ: Bluetooth headset cannot be charged normallyA: The Bluetooth headset has been placed for a long time. If it is not used for a long time, the lithium battery inside the Bluetooth headset will always be in use, and the headset will be in "sleep". As long as the charging time exceeds 20 minutes, the headset will display the charging statusThe earphone has not been used for such a long time, and it is not displayed after charging for more than half an hour. Check whether the earphone charging data cable plug is damaged, you can try another data cable. Or check if anything is blocking the charging point of the headset. If so, please clean it with a toothpick.