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  • LED Power Display & Up to 42H Playtime — Only 1.2hrs of charging time is required for the true wireless earbuds and 1.6hrs for charging case to get fully charged. One single charge keeps the earbuds serving for 7hrs and extend to 42hrs with the charging case (in mono mode). These earbuds can be used individually (mono mode) or simultaneously (dual mode). The wireless earbuds with dual digital power display tells the remaining battery in percentage.
  • Ergonomic Design for Sports — Unshakable and comfortable fit ear hooks and ergonomic shape make the wireless earbuds stay firmly in position with no pain while sports. Comes with 3 different sized eartips that fit snugly and comfy in the ears. The wireless earbuds will never fall off even do strenuous endurance training. Featured with its IPX6 coating, our wireless earphones are built for any lifestyle. Go ahead and wear them running in the rain, working out at the gym, cycling, or hiking.
  • Hi-Fi Stereo & Clear Calls — Built-in a professional 10mm speaker unit, the wireless earbuds perform the design of the composite vibration membrane to avoid sound distortion. In-ear design of the wireless ear buds bring you incredible 6D stereo sound. Dynamic treble and big bass, carefully tuned sound features, bring you an immersive sound, making you feel like in the centre of the stage. Hi-Fi stereo, hands-free calling during sports with wireless earbuds anytime and anywhere.
  • Bluetooth 5.3 Stable Connection — No More Troubled Pairing! KORSKR ear buds earbuds featured with the advanced Bluetooth 5.3 chipset ensure faster one-step pairing connection and more stable transmission. The earbuds with microphone provide quicker transmission for a more immersive audio experience when playing mobile games. These wireless earbuds sport connect seamlessly with devices up to 49 feet away.
  • Quick Pairing & Touch Control — Taking wireless earbuds out of the case and they will automatically pair and connect with themselves. Activate bluetooth function and search for “i21”. After the first successful connection, the wireless earbuds with microphone will automatically connect to the last paired device when reboot. Round shape touch sensors are well-designed on the back of the bluetooth headset, making it easier to operate blindly for phone call, volume control, Siri, etc.

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