1. BT v5.3. Chip: JL AC6973.2. Battery capacity: 350mAh for charging case, 30mAh for headset.3. Talk/music time: 4 hours. Standby time 180 hours.4. Sizes: 64*45*26mm. Total weight: 38g.5. Supports leader-follower switching, summon for Siri.