5.Reliable connectivity & wide compatibility. K23 wireless ear buds adopt bluetooth techlonogy which greatly improve the transmission speed and making a fast and stable connection. Low audio latency makes for enjoyable viewing too. Each earbud can function independently, if you put one into the charging case then take it out, they seamlessly restore stereo mode. The headphones wireless bluetooth are compatible with various Bluetooth-enabled devices, including phones, computer, TV, tablets etc. 4.Fast Pair & Easy Button Operation. After 1st successful connection, as soon as you take out the ear buds wireless bluetooth earbuds from their charging case,they will automatically turn on and reconnect to the lasted paired device immediately. The buttons on the K23 earphones not only let you play, stop, or skip through tracks and adjust the volume, they also offer an easy way to access your smartphone’s voice assistant and make and receive calls hands-free. 3.Sporty Design & IP7 Waterproof. The earbuds wireless bluetooth feature an ergonomic design and come with 3 sizes of soft ear tips (S/M/L). These buds fit securely and comfortably in your ears during movement such as running, workout, and more. The flexible ear hook makes them a pleasure to wear, leaving you free to focus on your music. With an IP7 waterproof rating and nano-coating, splashes and sweat won’t stop the headphones, so you can keep on moving to the music. 2. 4-Mic Clear Call & High-fidelity Audio. Each bluetooth earbud has 2 microphones built in, 4 microphones work together to filter out the ambient noise, enhancing the overall quality of the call. Your voice will be heard clearly by the people participating in the same call, without most of the noise from the environment.With large speaker driver units and an in-ear structure, these dual wireless headphones produce hi-fi sound, encompassing robust bass, clear mids, and bright treble. 1.130H Playback & Wireless Charging Case with LED Display. Each wireless earbud can last 8 hours of music time on a charge and total 130 hours with the 2200mAh large capacity charging case. The powerful battery allow for all day listening. Dual digital LED power display outside of the case is to show the power level for charging case and bluetooth headphones. The charging case supports USB-C wired fast charging and wireless charging.