Features: 1, Built-in 32G SD memory card : There are more than 2600 music storage for you with the bone conduction earphone2, The IPX8 adzuki bean x7 bone conduction headphones works well In the showe more→r or swimming pool3, The headphones fit for Bluetooth-enabled smartphone or tablet such as iOS/ IPhone/ Motorola /Samsung/ s9 plus/ vivo Notes: 1, Battery must be fully charged for the first use of headphones.2, Do not swim for more than 30 minutes each time3 , If you don't use it for a long time, please charge it at least once a month.4, After each exercise, clean the water from the surface of the headphones, especially the charging position magnetic, and clean it in time to prevent sweat …