Kindly Notice:\r\n\r\n1. Fully charged the charging case and earbuds before first time use;\r\n\r\n2. It is recommended that you charge the earbuds and charging case regularly to keep it has power if you not use it for a long time,to extend its lifetime;\r\n\r\n3. If the earphone is not connected with any device within 6 minutes,it willautomatically shut down.\r\n\r\n\r\nM48 ENC Noise Reduction True Wireless Stereo Earbud with the latest Bluetooth 5.1 tech,faster pairing,low latency, low energy and long rang RF coverage. Has 18 months after-sale service,any questions during use,please conact our customer service anytime.\r\n\r\n 1. Deep bass and HiFi sound quality: Delivers the immersive sound and enjoy the music;\r\n\r\n 2.Easy to use: One button control easily to turn on/off,play/pause/switch music, and hands-free calling;\r\n\r\n 3.Widely compatibility: Can be compatible with most Bluetooth devices;\r\n\r\n 4.Comfortable to wear: Come with S, M, L sizes ear caps for the comfort fit;\r\n\r\n 5.Ultra-long about 3-4H playtime: Once the earbuds were fully charged, you can enjoy your music time without needing a charge;\r\n\r\n 6. IPX7 waterproof: It protects earbuds from rain and sweat during sporting, running, jogging, and yoga, etc;\r\n\r\n 7.Advanced ENC noise reduction tech for calls: The noise reduction technology ensures your voice is heard clearly on the other end without interference when calling.