Specifications:
Model: TWS-K2
Product Type: True Wireless (TWS) Bluetooth Stereo Headphone.
Bluetooth Version: Bluetooth 4.1 (CSR) EDR; Class 2.
Supports HSP HFP A2DP AVRCP protocol.
Battery Capacity Display supports for iPhone.
Frequency Response Range: 21Hz-18KHZ
Operation Range: Up to 10 meters
Microphone: Built-in high-sensitivity microphone (-38dB).
Impedance: 16
Sensitivity: 95dB
Degree of distortion: ≤1%
SNR ≥95
Headset Battery: 60mAh Rechargeable Li-ion battery
Power Bank Box Battery: 450mAh Rechargeable Li-ion battery
Charge Time (for Power Bank Box): About 2.0 hours
Music Playing Time: About 3 hours (The Music Volume will affect the time)
Talk Time: About 4 hours
Standby Time: 40 hours
Charge Time:1 ~ 2 hours
Charge Port: Micro USB
Color: Red
Main Item Size: 2.8 * 2.8 * 2.0cm / 1.1 * 1.1 * 0.79in
Main Item Weight: 10g / 0.37oz
Package size: 18.0 * 9.0 * 3.5cm / 7.0 * 3.54 * 1.37 in
Package weight: 118g / 4.16oz

Package List:
1 * K2 True Wireless Bluetooth Headset
1 * USB Cable
3 * Earbud
1 * English / Chinese User Manual