Waterproof Sport Headphones Built-in 16GB Memory with Bluetooth Mode and Local Player Modes Operation Method: Power on/off: Press and hold the power button for 3 secondsBluetooth pairing: Open the waterproof headphones and smartphone bluetooth, select "SM828" on the bluetooth list of your phone, click to pair. When using next time, they'll automatically connect to the paired previous deviceBluetooth Mode/Local player(MP3 Mode)switching: Press the “+” and “-” at the same timeVolume adjustment: Short press the "-"/the "+"Previous/Next song: Long press the "-"/the "+"Pause/Play: Short press the power buttonFolder switching: Under MP3 mode long press the "+" until you hear "next folder" Download/delete song: Turn on the headset, then connecting the USB data cable to the computer, the red indicator light of the earphone will light up, and the computer will eject the disk of the earphone after a few seconds (please use the original data cable). Note: after unplugging the USB data cable, the headset will automatically shut down, and you need to turn it on again to use it. IPX7 waterproof, no more worrying about the headset being damaged in wet conditions. Enjoy the fun of using waterproof headphones in sports. (Not for swimming). The headset comes with 16G built-in flash memory, 300 songs have been downloaded, to solve the trouble of carrying the phone when moving. High fidelity sound quality, API-X lossless audio coding, CVC6.0 noise reduction, anti-4G interference, support automatic connection, high definition voice call. Bluetooth 5.0 enables improved noise reduction, sound quality and stability. Enjoy an immersive music experience with stereo surround sound at the moment of quickly connection. Large capacity battery, low consumption Bluetooth 5.0, fast charging, power display, real-time control. Plastic material, hollowed out design, 20g compact body, long wearing is not tired. Please Note: 1.The headphones are IPX7 waterproof, can resist the sweat water. We don’t recommend to use headphones underwater. 2. Audio formats supported Mp3, WMV, WAV, Flac, APE. Downloading other formats may cause the MP3 mode not to switch properly. 3. Headphones include 300 English songs already downloaded. (Download songs Not Support connecting with Apple Mac OS, but supports all other OS like XP Windows...) 4. Folder playback mode is convenient for managing various music. The next folder of music will be played automatically when the folder has finished playing.