Air-S4 BT5.1Wireless BT Headphones Ergonomic Semi-in-ear Sports Earbuds

Features:
BT5.1 chip provides faster and stable transmission, lower power consumption, strong anti-interference performance.
Adopt high-quality diaphragm and 13mm speaker unit, giving you a professional level of full stereo listening sense, HiFi sound quality.
Ergonomic semi-in-ear design, fit the ear canal, not easy to drop, comfortable to wear.
After the first pairing, just take the earbuds out of the charging case, the earbuds will automatically connect with your mobile phone, convenient to use.
Intelligent touch operation, you can easily play/pause, switch previous/next song, answer/hang up, adjust volume, etc.
Widely compatible with BT-enabled smart phones, tablets, laptops, etc.

Specification:
Color: Black/White/Green(optional)
BT version: V5.1
Transmission distance: 10m-15m
Supported protocol: A2DP1.3/HFP1.6/HSP1.2
Shell material: ABS+PC
Speaker size: 13mm
Frequency response: 20Hz-20KHz
Impedance: 32Ω
Sensitivity: 105db±3db/1KHz
Wearing type: Semi-in-ear
Battery capacity: 200mAh(charging case), 30mAh*2(earbud)
Rated power: 3mW
Maximum power: 5mW
Earbud size: 3.1 * 1.6 * 1.6cm /1.22 * 0.63 * 0.63in
Charging case size: 4.4 * 4.3 * 2.1cm /1.73 * 1.69 * 0.83in

Packing list:
1 * Pair of earbuds
1 * Charging case
1 * Charging cable
1 * User manual