Specification: Name: Bluetooth Hat.  Model: G17021.  Specifications.  Color: Blue/Black/Gray White/Dark Gray.  Materials: acrylic fibers.  Bluetooth Version:4.1.  Transmission Distance: CLASSⅡ.  Operating Range: 10 meters.  Battery Capacity: 180MAH.  Frequency Range: 20-20KHZ.  Sensitivity: 95DB.  Impedance: 32 ohm.  Speaker size: 32MM.  Charging Time: 2H.  Voice Continuous Talk Time: 4-6H.  Bluetooth Music Playback Time: 3-6H (at 70% volume).  Function: support music + connect phone.     Features: -High·definition Sound Quality.volumemeans To Adjust,and The Standby Time 18 Hours,listening To Music 3 Hours,usb Charging 2 Hours.  -Bluetooth supports wireless connection of computers, mobile phones, tablets, notebooks, and the effective output range of Bluetooth is 10M.  -From up to 10M of distance with free line of sight. Universal Bluetooth v4.1 technology with forward/backward.  -Binaural stereo, with built-in microphone, you don’t have to hold your phone and wear earplugs anymore.  -Set-in Li-ion chargeable battery, charge via USB Cable, long stand-by time.  -Acrylic fiber material, exquisite workmanship, soft touch and better elasticity.     Note: -Please allow a bit error due to manual measurement. please make sure you do not mind before you bid.  -The color may have different as the difference display, please understand.     Package Included: 1 x Hat