The Pivoi Sport water resistant and sweatproof wireless earbuds are built with the latest Bluetooth V5.0, and HSP/HFP/A2DP/AVRCP/AVDTP/AVCTP/GAVDP/SPP/GAT Bluetooth profiles to provide superior connectivity. The latest Bluetooth technology maintains a secure and steady wireless connection for call management and music playback up to 10 meters. Fully charge in only 1.5 hours. Up to 5 hours of working time and 100 hours of standby time mean more listening and less charging. An earbud prompt " battery low' tells you when it is time to charge. Each earbud has an LED light that flashes "red' to indicate a low battery; steady "red" while charging ; and "blue" when fully charged. The charging box will display the same information while it is charging and only takes 3 hours for a full charge and has a standby time of 300 hours. .