With TWS EDR chip for HiFi calls and stable connecting, Support stereo music and phone calls.  USB charging: charging box provides you with more flexible user experience.  Bluetooth 5.0 technology, better sound quality Strong compatibility, compatible with devices as long as they are Bluetooth-enabled Double main and subsidiary earbuds design, 360° stereo sound effect, innovative and excellent Adopt True Wireless Technology, enjoy your wirelessly sports CVC noise cancellation technology reduces the noise and keeps the original sound. i7 Mini TWS Bluetooth Version V5.0+EDR (both sides), ultra-low consumption Bluetooth Mode A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Bluetooth Frequency 2.4GHz Bluetooth Range 10 meters Earbud Battery Capacity 50mAh polymer rechargeable battery Case Battery Capacity 400mAh rechargeable polymer battery Talk/Play Time Up to 2.5 hours Standby Time 60 -80 hours Case Charging Time About 2 hours Earbuds Charging Time About 1.5 hours  Package Included: 2X Bluetooth Headphones(left and right earphones) 1X Charging box 1X Headphone DC charging cable 1X USB Charging Cable 1X User Manual