1.Master-slave switch 2.Ergonomic and never-drop design 3.IPX5 waterproof 4.portable charging case 5.HD sound quality and rich deep bass 6.Touch-sensitive Control 7.type-C charging port 8.hands-free calling&voice assistant Chip: JL6936D IPX5 sweat proof Bluetooth Version: V5.0 Charging case dimension: 80*32*31mm Earbud dimensions: 26*21*18.4mm*2 Net weight: 4.5g*2(Earbuds)/41g(Charging case) Wireless working range: 10M (without obstacles) Speaker: Φ6mm*2 Speaker frequency: 20Hz～20KHz Input voltage / current: DC 5V/1A Earbud Battery: 50mAh*2(Fully charged in 1.5H) Charging case battery: 420mAh Play time: 6H Talk time: 6H Charging time: about 2H(Charging case) Profiles supported:: HSP, HFP, A2DP, AVRCP ** Local seller fast delivery ** Local warranty 1 year from our service center