Digital Power Display and Wireless Charging: With dual digital power display, it is easy to know the remaing power of charging case and you'll know exactly earbuds are being charged when you put them into the charging case. Charging case supports wireless charging and USB C Charging, just place the charging case on the wireless charging pad(not inclued) or plug the USB C cable(Included) to charge the case. The number of digital power display flashes when you charge the charging case. 48H Playback and One Step Pairing:Each over ear headphone has 8H plackback on a single charge.Charging case provides 2 times extra charge for both ear buds.The total battery life of these bluetooth earphones is 48H while using in turn.Earbuds will auto power on while picking them out and auto pair with your device after first connection.For first paring,open the case and take earbuds out,then choose"K23"on bluetooth list of your phone,and then sport earbuds will connect and work with it. HD Stereo Audio and One Button Control: Our working out earbuds adopt 10mm speaker which can perform bass, midrange and treble. You will hear clear HD stereo sound with punchy bass. It is easy to control music and phone calls through multifunction button of each earphone. Very convenient for play/pause music, track previous or next songs, volume +/-, activate voice assistance, answer, end or reject calls. Comfort Design for Sports: These in ear headphones with fexlible earhooks. Each hook has been developed from soft silicone material that adapts to different sized ears, you will feel comfortable while doing sports and both wireless headsets will secure stay on ears. The sound chamber creates an airtight space with your ear canal that isolated from outside ambient noise and makes earbuds to deliver stereo sound. So, these wireless earphones are perfect for sports, sleep, music, etc. Clear Call and IPX5 Waterproof: Wireless headphones adopt bluetooth 5.0 tech and latest chip,which filter and process ambient noise while having phone calls,microphones capture your clear voice for transmission to the listener,your sound will be heard clearly and loudly.These wireless sport headphones are rating at IPX5 waterproof,the surface of both in ear earbuds is sealed to prevent sweat or rain from entering,and the internal nano-coating to airborne moisture from damaging the components.