Future Headphones Come.A Companion for running,walking,GYM ,sports and travel. Behind the neck，Lightweight,Portable and in Fashion--An Art from Granvela. Best Audio Gift to Friends, Kids and Family.
Features: Features: Bluetooth Call-Answering and Music Streaming

Connect to Cellphones,iPad, MP3 Players, Tablets, Computers, TVs, etc.
Built-in Rechargeable Battery
Provides Over 9 Hours of Music Streaming
Charging via USB Port with Included Cable
Adjustable Volume Control
Impressive Bass Response
Full Range Stereo Sound Reproduction
Comfortable & Ergonomic Wearing
Bluetooth Audio Streaming:
Quick & Easy Connection
Instant & Wireless Music Playing
Works with All of Your Favorite Devices
(iPhone, Android, Smartphone, iPad, Tablet, MP3 Player, etc.
Bluetooth Call Answering:
Answer or Reject Incoming Calls
Hassle-Free Talking with No Need for Headphone Adjustment
Playing Music Automatically Silences During Incoming Calls
Crystal Clear Voice Quality and Reception

Specicication:
Bluetooth Version: V4.0
Driver unit: 40MM
Range: 33 feet (10 meters)
Talking Time: Around 6-8 hours
Playback Time: Around 6-8 hours
Charging Time: 2 hours
Charging Voltage: 5V
Battery Capacity: 300mAh
Dual mode: Wireless & Wired
Resistance:32Ω±15%
Wire Connectors:3.5mm
Sensitivity:108±3dB