Tozo E1 Wireless Earbuds Build In Mic Clear Calls Ergonomic Light Weight, Black [EQs Options Seamless Sharing] Tailor the sound with the TOZO app further, which allows you to adjust bass levels, music style and more to your liking, and experience the joy of sharing your customized EQ with global audiophiles in exclusive ?EQ zone?. [Fine Sound Clear call] TOZO E1 equipped with 6mm driver units and microphone, deliver an immersive audio experience. Whether you're listening to music or making calls, you can enjoy crystal-clear sound and deep bass to a whole new level. [Extended Battery Life] Up to 8.5 hours of music playback on a single charge and with 30 hours of music total playback with the charging case after full charged via USB A to USB C charging cable, you can listen to 450 songs during your daily commute. Equipped with a three-color battery level indicator that lets you easily monitor the remaining power. [Small and Comfortable to Wear] Weighing only 3.9g per single bud, our Wireless Earbuds are designed for ultimate comfort. The ergonomic design ensures a secure fit, allowing you to wear them all day without any discomfort. [Fast Pairing] Enjoy fast pairing and reliable transmission with Bluetooth 5.3 technology, allowing you to stay connected and enjoy your favorite tunes without interruptions.