High Waterproof Level IPX8 waterproof is designed for use in water, no more worrying about the headset being damaged in wet conditions. Enjoy the fun of using waterproof headphones in sports. Designed For Sports Weighing just 29 g, the earphones feel weightless on the head. Earplugs fit snugly in the ear, preventing water from entering the ear during swimming and falling out during exercise. 18H Playback Time Ultra-long playback and 250mAh high-capacity battery with low energy consumption, 1.5 hours fast charging. Reliable power display with real-time control. Achieve wear all day long. HiFi Sound Quality Large dynamic speaker, 10mm nano-composite film delivers a wide dynamic range and 6D bass effect. Built-in noise reduction, let you hear more details. New Bluetooth 5.0 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. 16GB Memory Wireless headphones with a large 16GB memory for storing music at will. Manage your music folders according to your preferences. Effectively avoid carrying a phone when you are running. Please Note: 1. Bluetooth signal can't spread underwater, please switch to MP3 Mode when you swimming.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. Brand CYBORIS Model Number SM608 Waterproof Level IPX8 Bluetooth Version 5.0 Bluetooth Range 10M Play Time 18 Hours RAM Memory 16GB Net Weight 29g Audio Format Mp3,WMV,WAV,Flac,APE How to connect Bluetooth? (1) After booting, the blue and red lights flash alternately and the headset enters the Bluetooth pairing state. (2) Turn on the Bluetooth of phone. The blue light flashes intermittently after successful connection. How to switch on/off? Long press the middle function key for 2 seconds to turn on; Long press the middle function key for 5 seconds to turn off. How to switch playback modes? Quickly double-click "Volume +" to switch to MP3 mode or Bluetooth mode. How to switch folder? In MP3 mode: Press and hold "Volume +" for 6 seconds to switch to the previous folder; Press and hold "Volume -" for 6 seconds to switch to the next folder. Switch songs and adjust volume (1) Switch songs: Press and hold "Volume +" or "Volume-" for 2 seconds to switch to the previous or next song； (2) Volume adjustment: short press "Volume +" or "Volume-" to adjust the volume. How to download/delete files? After connecting the USB data cable to the computer or other devices in any state, the indicator light is always red and the blue light is flashing quickly, then the memory management mode is entered. (Please use original USB cable)