【Revolutionary Bone Conduction Technology】 Experience music like never before with our cutting-edge bone conduction technology. Instead of covering your ears our headphones transmit sound directly through your bones leaving your ears open to the world around you. This innovative design not only delivers exceptional audio quality but also enhances your safety by keeping you aware of your surroundings. 【IP68 Waterproof】Our Bluetooth headphones boast an IP68 waterproof rating allowing you to confidently take your music underwater. With compatibility with swim caps and goggles and featuring an integrated MP3 player they are the perfect choice for swimmers. Whether you re swimming diving or simply spending a day at the beach our headphones are your ultimate water-resistant companion. 【MP3 Mode & Bluetooth Mode】Enjoy audio files with our built-in MP3 player that comes equipped with 8GB of storage space eliminating the need for an additional MicroSD card. This ample storage can store up to 2000 songs or audiobooks all without requiring a smartphone. Alternatively you can connect via Bluetooth 5.3 for added flexibility. 【Open Ear Safety and Comfort】TopVision s bone conduction headphones are designed to provide an audio experience without the need for earplugs ensuring pain-free comfort. They also guarantee complete awareness of your surroundings enhancing safety. These headphones are expertly crafted for sports work and everyday use. 【6 Hours of Playtime (at 80% volume) with Fast Charging】 A single charge provides up to 6 hours of continuous music and podcasts keeping you energized during your workouts. With quick charging just 2 hours of charging can provide a full battery. Operation Guide ●Power on: Under power-off mode press and hold the M button for 3 seconds. ●Power off: Under power-on mode press and hold the M button for 3 seconds. ●BT connection: In the power-off state press and hold the M key for 3 seconds to enter the Bluetooth pairing state.Search for OPENEAR Bone X2 in Bluetooth menu and click to connect. ●Connection successful: The headset is successfully connected to the device. ●Switch MP3/BT: Under power-on mode double click MFB. ●Auto power off: If it is not connected or disconnected from the Bluetooth connection after powering on if there is no operation it will automatically shut down after 5 minutes and the automatic shutdown function when connected to a mobile phone will be canceled. ●Cancel call: Before the other party does not answer the outgoing call click the M button to cancel the dialing. ●Answer call: When there is an incoming call click the M button once to answer the incoming call. ●Reject call: Double-click the M button to reject the incoming call. ●Hang up call: When the call is complete click the M button to end the call. ●Activate Voice Command:Quickly triple-click the M button to activate the SIRI function. ●Play/pause music: When the music is paused click the M button to continue playing the music.When the music is playing click the M button to pause the music. ●Volume up/down: Click + button to increase volume / click - button to decrease volume. ●Restore factory setting: Under power-off mode press and hold the power button for 10 seconds to restore the factory.