The following is from the product packaging: • Communication method: Bluetooth standard Ver. 4.1 compliant • Maximum communication distance: Within 10m in a clear line of sight • Supported Bluetooth profiles: A2DP, AVRCP, HFP, HSP • Supported codecs: SBC • Power supply: DC3.7V lithium polymer battery (built-in) • Charging time: Approximately 3 hours * Usable time: Continuous communication (during music playback): • Up to approximately 7 hours Continuous standby: Up to approximately 200 hours * • Weight: 14g Accessories: Ear tips (XS, S, M, L), clip, USB charging cable (30cm) --- Purchased in 2019. Operation confirmed. There is some wear and tear; please check the condition in the photos. *The charging connector cover is torn.