Features:
Retractable cable with one-click to rollback earbud, making the cable orderly; Hands-free with clip-on-collar design, easy to carry.
BT V5.0 and compatible most devices, built-in sensitive range alerts and vibrate incoming call alarm. 
Built-in high-definition microphone, noise reduction enhances call audio transmission performance, clear voice transmission, high-quality calls.
Multi-point connection, release your hands, ensure driving safety, you can connect two smart phones at the same time.
Built-in rechargeable 100mAh battery, long-lasting battery life, can provide up to about 6 hours of talk time, about 5.5 hours of music time and about 110 hours of standby time.
 
Specification:
Brand Name: Fineblue 
Model: F2 Pro
Color: Black, White(Optional)
BT Version: V5.0
Sensitivity: 95±3dB
Impedance: 16Ω
Transmission Distance: 10m/33ft
Frequency response: 50-20KHz 
Wearing type: In-Ear 
Material: ABS+Alloy 
Charging Time: 2h 
Music Time: 5.5h 
Talk time: 6h 
Standby time: 110h 
Battery Capacity: 100mAh Li-ion Battery 
Product size (L x W x H): 5.2 * 2.5 * 1.5cm / 2.05 * 1.98 * 0.59in
Product weight: 19g / 0.67oz
Package size: 13 * 10.5 * 4cm / 5.11 * 4.13 * 1.57in
Package weight: 87g / 3.07oz
 
Package List: 
1 * Earphone
1 * USB Cable
2 * Eartips
1 * User Manual