Specifications:
Bluetooth Version:CSR4.1
Chipset: Unit Kingdom import CSR
BatteryCapacity:130mAh
Sound System:Stereo Dual Track
Battery: Rechargeable Lithium Polymer Battery
Support Profiles: Headset, Handsfree
IOS Battery Displays: Yes
Stand-by time:240hours
Talk time:12hours
Music time:10hours 
Charging time:2hours
Volume Control/Next song: Yes
Voice Prompt: Yes
Support:HSP/HFP/A2DP/AVRCP/CVC
Input charging Standard:DC 5V 
sensitivity: 90db ± 3db
Resistance:16Ω ±15%
frequency response: 20-20000hz
Best Transmission Distance:10m(barrier-free space)
Dmension: 48*16.5*6.0mm
Earphone weight: 6.7g
Feature: Support connect two device at the same time

Package list: 
1 * Bluetooth earphones (Contain Ear Hooks and Ear Tips )
1 * usb charging cable
2 * pair silicone earmuffs (S)
1 * pair silicone earmuffs (M)
1 * Cable buckle
1 * Cable Clamps
1 * Earphone bag
1 * user manual

Note:

*Do not make it charging 10 hours continuously for the sake of lifespan.

*Do not attempt to take apart the product, especially non-professionals.

*Do not expose it to the sun or high heat. High heating will short lifespan of electronic components, damage battery and deform some plastic parts.