A true Wireless Stereo Earphone - When paired with a phone over Bluetooth, free buds 3 provides users with a true stereo experience when making calls or listening to music. The two earbuds also undergo smart switching depending on the usage scenario and battery level to provide users with an optimum listening experience Low power consumption, long battery life – free buds 3 uses a low-power Bluetooth chip for reduced power consumption and long battery life. A single charge gives users about 2.5 hours of voice calls or about 4 hours of continuous music playback. Used in conjunction with the charging case, This extends to more than 12 hours of calls and 20 hours of music playback Noise reduction - each earbud has two MEMS silicon microphones featuring call noise reduction technology, which effectively cancels out background noise Wind noise reduction - Supports wind noise reduction at a maximum wind speed of 20kmh to ensure the effect of the call Wireless charging (charging case) - The earbuds are automatically charged when stored in the charging case. The included charging case supports both wired and wireless charging. When the earbuds are inserted in the charging case, The earbuds will be charged first Actual capacity may vary slightly. This capacity is the nominal battery capacity. The actual battery capacity for each individual phone may be slightly above or below the nominal battery capacity.