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One Step Pairing Taking the two earbuds out of the charging case, the left earbud will connect with the right automatically, just open the bluetooth function on phone, and find the model ”L21”to connect. Reconnect automatically after initial pairing. HiFi Sound Adopt bluetooth 5.0 technology enable you to enjoy HIFi stereo sound and hear the phone calls in clarity, also help block surrounding noises, such as wind noise caused by running, biking, jogging, etc. Portable Charging Case Portable charging box gives you the opportunity to recharge your headphoens when on-the-go. Play time up to 3 hrs for a single charge. Total 10 hours with charging case. How to Change the Languages These tws earbuds have two languages, English and Chinese, you can change the languages by clicking twice of the MFB button when in disconnected status. Specifications Model: L21 Waterproof Rate: IPX5 (Sweatproof) Operating Range: Up to 33 feet/10 meters (No obstacle between) Earbuds Charging Time: about 1 hrs Box Charging Time: About 3 to 4 hours Music time: about 3 hrs consistently Standby time: 200 hrs Talk time: About 4 hours Battery Capacity: 50mAh/3.7V, 300Ah/3.7V Earphone Type: In Ear Earphone Bluetooth Version: Bluetooth 5.0 Microphone: Built-in Mic What’s in Box ✔2x Wireless Bluetooth Earbuds ✔1 x USB Charging Cable ✔1 x Charging Case ✔1x User Manual Notice1.Please use charging cable provided, or certified brand charging cable. 2. We don't recommend using fast charging, or power bank. 3. If your charging case out of power, please turn on the earbuds by pressing the MFB button about 3 seconds. 4.If your earbuds connected successfully, but one can not hear voice, please try to adjust the right channel and left channel by phone.