"BT version 5.1 Frequency range 2.4GHz-2.483 GHz Support protocol Handset, Hands-free, A2DP, AVRCP Chip JL6963A Battery capacity Headphone: 40mAh Charging stand: 1200 mAh Play time about 4-5 hours Talk time about 3-4 hours Standby time The headset is turned off and standby: >6 months Charging time Headphone: about 1 hour, charging case: about 1.5 hours Effective distance 10 meters [barrier-free open space] Button One touch button LED + digital display 188 display Headphones: red/blue LED Charging box: digital display 188 display USB charging case: One MICRO+ USB"