Earphones parameters:

Bluetooth profiles：HSP, HFP, A2DP and AVRCP
Effective distance：10 meters (equal to 33 feet)
Built-in 65mAh lithium battery
Frequency range：2.4-2.48GHz
Frequency response：100Hz-20kHz
  Distortion：≤1%
  Microphone sensitivity：-40db
Music time: 3-4 hours
  Standby time：120 hours
Built-in lithium battery：65mAh
Charging port：Micro USB
  Charging time：Approx 1-2 hours
Unit weight：Approx 20g
  Cable length：55CM
packaging size：118*80*52mm

packaging:

1*headphones
1*USB Cable
1*User Manual

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• This bluetooth in-ear headphones offers incredible crystal clear sound no matter your taste in music or answering a phone call; and you will never miss an in coming call phone with its voice prompt function.
• This wireless bluetooth headphones can intelligently filter ambient noise and reduce background noise, offers incredible sound quality, you can focus on your favorite music and enjoy yourself when you are at home, in the office, in the workout places etc.
• It is great for gym, jogging, running, cycling, biking, hiking, full body workout, exercise, training etc.
• This wireless headset use advanced bluetooth version 4.1, easy to pair with iPhone, iPad, Samsung, Sony, HTC, Android cell phones, Windows phones, and most bluetooth enable devices.Ergonomically design!
• This wireless headset, Made by TechCode with best quality.

This bluetooth in-ear headphones offers incredible crystal clear sound no matter your taste in music or answering a phone call; and you will never miss an in coming call phone with its voice prompt function.TechCode