Bluetooth Chipset: Jieli 6936B or Airoha 1536U (Bluetooth Version 5.0) ,Support stereo music playing Support the cell phone incoming call,hanging up and re-dialing functions Support binaural call, Can be used in single mode or twins mode Support Siri, Auto Power On/Off, Full touch operation , Playing time: 4-5 housing , Battery capacity:45mAh for earphone; 450mAh for charging box Working distance: ≥10M, Charging time for earbuds: 0.8 hour, Earbuds size: 39mm x 24mm x 23.5mm