The Remax TWS-10i True Wireless Stereo Music Earbuds is equipped with Bluetooth V5.1 technology and it provides a very fast and smooth 10m connection range.Supports good compatibility with all operating systems from Android to iOS, simple connection with smartphones via Bluetooth.In addition, the charging dock included on the Remax TWS-10i Bluetooth headset is also integrated with a 700mAh battery capacity, allowing users to charge the headset 3 times, providing enough power when there is no direct power source.40mAh headphone capacity for up to 4 hours of music and talk time experience while only 2.5 hours fully charged.Frequency: 50Hz-20KHZImpedance: 160hmPower Output: 10mWConnection Type: WirelessCharging Case Battery Capacity: 250mAHEarbud Battery Capacity: 30mAHPlay Time: 4HStandby Time: 200H The Remax TWS-10i True Wireless Stereo Music Earbuds is equipped with Bluetooth V5.1 technology and it provides a very fast and smooth 10m connection range.Supports good compatibility with all operating systems from Android to iOS, simple connection with smartphones via Bluetooth.In addition, the charging dock included on the Remax TWS-10i Bluetooth headset is also integrated with a 700mAh battery capacity, allowing users to charge the headset 3 times, providing enough power when there is no direct power source.40mAh headphone capacity for up to 4 hours of music and talk time experience while only 2.5 hours fully charged.Frequency: 50Hz-20KHZImpedance: 160hmPower Output: 10mWConnection Type: WirelessCharging Case Battery Capacity: 250mAHEarbud Battery Capacity: 30mAHPlay Time: 4HStandby Time: 200H