Baseus Bowie E2 True Wireless Earbuds are TWS Bluetooth in-ear wireless Earbuds designed for compact TWS. It is made with ABS and PVC. This  TWS supports the latest Bluetooth Version 5.2 and the maximum communication distance is about 10m. the music playback backup time of this TWS is about 5 hours with a standard 70% of the volume. The music time with a charging case can be extended to a total of 20-25 hours. The charging time for both the case and TWS buds is about 1 hour. The Frequency response range is 20 Hz to 20 kHz. This TWS earphone utilizes a USB type C port as a Charge interface. The Type-c port is Compatible with all common wireless devices like smartphones and laptops. The internal battery capacity is 40mAh or 0.148Wh for the Earbuds and 350mAh or 1.295Wh for the charging case. Baseus Bowie E2 True Wireless Earbuds offer no warranty.