Wireless connection: Bluetooth 5.0Net weight of single earphone: about 4.1gTotal weight with charging case: about 35.4gTalk time: about 4 hoursBattery life with charging box: about 12 hoursSingle headset battery capacity: 43mAhCharging box battery capacity: 300mAhHeadphone charging time: about 1.5 hoursCharging time of the charging box: about 2 hoursHeadphone size: 26.65x 16.4x 21.6mmCharging box size: 62x 40x 27.2mmCommunication distance: 10 meters (barrier-free open environment)Bluetooth protocol: AVRCP / HSP / HFP / A2DPCharging interface: Micro-USB (without charging cable, users need to choose separately)Whats in package: Charging box x 1Redmi airdots 2 x 1Ear cap x2 pairs (S/M/L, M pre-installed)Manual x 1