Bluetooth 5.3 & IPX7 Waterproof】- Featuring advanced Bluetooth 5.3 Technology, wireless headphones greatly improve transmission speed and provide you with a low-latency listening experience. Plus, wireless earbuds boast IPX7-rated protection that defends against liquids in any weather conditions. 【Environment Noise Cancellation & 4MIC】- Built-in Dual-Mic Environment Noise Cancellation Technology, noise cancelling earbuds can effectively block out 90% of background noise and make you enjoy crystal-clear calls even in noisy environments. Tips: Please wear 2 earbuds during the call to ensure clear calls. 【Long Playtime, Fast Charging】- Get up to 8 hours of battery life on a single charge with a case that extends it to 36 hours. You can listen to these earbuds all day and all night. Put CXK E12 bluetooth earbuds in the charging case for 5 minutes and enjoy up to 1.5 hours of listening. 【Premium Fidelity Stereo Sound】- Equipped with 13mm drivers, wireless earbuds delicately reproduce heavy low frequencies and clear, high-resolution mids and highs, presenting an open soundstage with detailed sound quality. You can enjoy any music style you want. 【One Step Pairing & One Button Reset】- Thanks to Hall Switch, bluetooth headphones will be automatically connected to the last paired device once open the case. In addition, headsets are equipped with a reset button. Simply place the headphones into the charging case and press the button on the charging case to reset them.