【Supports TOZO APP】You can customize your audio experience for your specific preferences, try 32 preset equalizer settings, white noise options and personalized sound adjustments. You can also sharing your own EQs over 2000 global audiophiles in exclusively sharing ‘EQ Zone’. 【14.2mm Dynamic Drivers & Dual Mic Call DNS】The bluetooth earphones feature an 14.2mm dynamic driver, providing you with a more surround effect and a stronger sense of immersion when listening to music or playing games. Adopting Dual-mic Call Noise Cancelling technology with headsets to effectively eliminate background noise and ensure clearer calls. 【Extended Playtime & Dual Power Display】Each 45mAh earbud delivers up to 10 hours of continuous play. The 500mAh charging case offers 4 full charges for both earbuds—rotate them to enjoy an impressive 88 hours of non-stop listening. Recharge easily via wireless charger or included USB-A to USB-C fast charging cable. The integrated LED display lets you check the battery level of each earbud and the case at a glance, so you’re always ready to go. 【IPX8 Waterproof & Semi-In-Ear Design】These earbuds boast an IPX8 waterproof rating and sweat-proof nano-coating, there is no need to worry about rain or sweat, which can protect your earphones in various conditions. The semi-in-ear design provides a secure and comfortable fit, making them perfect for active individuals. 【Extra Long Playback &Dual Power Display】TOZO Tonal Fits (T21) offers up to 6 hours playback on a single earbuds charging and an additional 44 hours of charging case after fully charged via wirless charger or USB A to USB C fast charging cable. Featuring integrated LED digital display, you can easily keep an eye on the remaining battery life of each earbuds and charging case, always be ready. 【One Step Pairing & Seamless Connectivity】Compatible with various devices, including iOS, Android, and Windows, and will automatically reconnect when the case opens after the initial pairing. Bluetooth 5.3 ensures a stable and quick connection with minimal latency, making these earphone ideal for workout or working.