Specifications:
IPX4 sweat proof
Chip: Bluetrum AB5376A
Bluetooth Version：V5.0
Earbud Battery: 40mAh*2(Fully charged in 1.5H)
Charging case battery: 300mAh
Charging case dimension: 49.8*49.8*24.3mm  
Earbud dimensions: 39.4*20*17mm*2
Net weight: 4.0g*2(Earbuds)/34g(Charging case)
Wireless working range: 10M (without obstacles )
Speaker: Φ13MM diaphragm
Speaker sensitivity: 111±3dB  1kHz/1mW
Profiles supported: HSP, HFP, A2DP, AVRCP
Impedance: 27Ω±15% 1kHz
Speaker frequency: 20Hz～20KHz
Input voltage / current: DC 5V/1A
Play time: 4H (in medium vol.)
Talk time: 4H (in medium vol.)
Standby time:40H
Charging time: about 2H
Features:
1.IPX4 sweat proof ，design for sport
2.Smart touch control,
3.Haft in-ear design，fit comfortably in your ear.
4.13mm diaphragm drivers,private high-quality music sound.