Product performance: 9D stereo sound, HIFI surround, intelligent noise reduction, Bright suface over UV, LED digital display, Environmental protection material, Hall switch (open cover and connect), IPX5 level living waterproof. Bluetooth version: 5.0 Bluetooth protocols: HFP, A2DP, HID, AVRCP, AVCTP, AVDTP Bluetooth distance: >10m earphones battery capacity: 40MAH Charging box battery capacity: 300MAH Single earphone music playback time: 4-6 hours earphones standby time: 26H (1.5mA) Charging time of charging box: 1.5 hours earphones charging time: 1 hour Full charging compartment earphone charging times: 10 times Frequency: 100-10KHz Sensitivity: 95±3dB Input current: 5V...0.5A Charging compartment charging interface: Micro USB Put the headset into the charging compartment: the red and blue lights flash slowly during charging, when fully charged, the red and blue lights go out Speaker material: copper ring composite film, diameter 8mm, resistance 32 ohms Use action: Touch and click: answer (long press for 1 second to reject)/play/pause/ Touch double click: L -> previous song R -> next song Touch 3 clicks: L -> volume down R -> volume up Weight: about 80g earphone size: 23mm*15mm*26mm Charging compartment size: 67mm*32mm*27mm Outer packaging color box size: 80mm*35mm*100mm appendix: A pair of earphones Battery charging stand x 1 ear cap x 4 Data cable x 1 Manual x 1 Box x 1