More Details:

Specification:
Bluetooth Version: 4.1
Bluetooth Profiles: HSP， HFP， A2DP and AVRCP
Effective Distance: 10m
Frequency range: 2.4-2.48GHz
Frequency response: 100Hz-20kHz
Distortion: ≤1%
Microphone sensitivity: -40db
Music time: 3-4 hours
Standby time: 120 hours
Charging time: About 1-2 hours
Built-in lithium battery: 65mAh
Charging port: Micro USB
Net Weight: About 20g

Package Included:
1 X Bluetooth Earphone 
1 X Charging Cable
1 X Manual