About this item 40H Playback and Dual LED Power Display: These Bluetooth headphones can be used for about 6 hours (50%-60% volume) on a single charge, and with the compact charging case allows you to use them for 40 hours continuously. The digital LED power display on the outside of the case facilitates easily manage of power. The LED light will flash the digits from 1% to 100% when charging for the charging case, and the flashing battery icon display the charging status of both earbuds. Leading Bluetooth 5.3 Technology and Effortless Pairing: These wireless earbuds adopt the advanced Bluetooth 5.3 technology, providing you with 2X faster transfer speeds (80% higher than the previous generation) and a more stable connection, with almost no delay. Taken from the charging case, wireless headphones will be paired with each other automatically, and just hit on Bluetooth list to connect, avoiding complex operations and saving waiting time. 14.2mm Big Dynamic Speaker and 4 ENC Mics: The Blue