1The bone conduction speaker supports nondestructive playback of HIFI sound quality. 2Bluetooth 5.0 technology ensures a stable connection of 10m/32.8ft, so you can make phone calls and listen to music easily. 3Comfortable and stable to wear, the ergonomic structure fits into the ear to reduce slips and falls during activity. 4IP68 waterproof performance allows you to swim while listening without worry. 5The contact protection plate effectively protects the metal contact and extends the earphone's service life. 6With 32GB of memory, can store about 10,000 songs, and can be used as a USB flash disk.Item Type:BoneConductionEarphones Material: Silicone+ABS Weight: Approx. 114g/ 4.0oz Color: Black Bluetooth Name of Headset: Y9 Transmission Distance :10m/32.8ft Waterproof Rating :IP68 Battery Capacity :300mA lithium battery Storage Capacity :32GB Charging Voltage :5V 500mA lithium battery Bluetooth Version :5.0 Supported Music Formats :MP3, WMA WAV, APE, FLAC Support Bluetooth Protocol: AVRCP14 A2DP12 HFP16 HSP12 Temperature Range :-40C to 70C Mark Sensitivity :-37dB Instructions: 1. Switch the machine on and off: press the "on" key for 3 seconds, then the machine will enter into MP3 playing by default;If the operation is out of control and the machine cannot be switched on and off, long press the "on" key for 10 seconds to force reset and restart; 2.MP3/ Bluetooth switch: when the machine is on, double click the open key to switch MP3 mode/Bluetooth mode; 3. Answer/hang up: Press the "on" button to answer the call, then press again to hang up, press "pause"/" play "again, pause the play for 5 minutes and it will shut down automatically without operation; 4. Connect Bluetooth: Double click the on key in MP3 mode to switch to Bluetooth mode, the indicator light is red and blue flashing, and the device is searched to Y9 for connection; 4. Chinese and English sound prompt: press the on-off button for 3 times to switch the Chinese and English sound; 1 x Y9 Earphone 1 x USB Cable 1 x Instruction 2 x Plug 2 x Accessory 1 The charging cable is not waterproof.2 Bluetooth signal will interfere underwater, so it is not recommended to use the headset underwater.