Technology & Digital Display: Based on the unique panoramic space capsule design concept of TOZO Industrial Design Lab's,it perfectly demonstrates the contour of internal earphones and charging box. And the smart LED digital screen can intuitively reflect real time remaining power. High-Fidelity Audio &Crystal-Clear Call: Equipped with 4 microphones to reduce ambient noise through dual-mic AI algorithm, so you can always enjoy High-fidelity audio and Crystal-Clear call even in noisy environments. IPX8 Waterproof & Bluetooth 5.3: with 6mm diameter loud speaker,the original sound is a perfect recovery,making the treble sweet and clear, the bass is strong and powerful. Long Endurance: The earbuds on a full charge can meet 9 hours while listening volume 50%; earbuds and charging box can achieve total endurance of more than 40H. Preset and Customize EQ, TOZO Acoustic Lab's offers 16 preset EQs in the TOZO APP based on different styles of music, you can also customize your audio preferences.