Bluedio U (UFO) PPS 8 Drivers High-End Bluetooth Headphones Revolution/3D Sound Effect/Aluminum Alloy Build/Hi-Fi Rank Wireless&Wired Over-Ear headsets with Carrying Hard case Gift (Black and Red)

Bluedio U (UFO)Premium Wireless Headphone is first and foremost committed to one thing: the superb sound, achieved by Bluedio exclusive PPS8 acoustics technology and the built-in DSP processor. And its incredible 25 hours battery life is ensured by the latest Bluetooth 4.1 low-power technology. Furthermore, UFO is beautifully crafted with top notch aviation material: Al-Ti alloy, sturdy enough to be durable for long periods of time. Altogether, Bluedio U (UFO) redefines what reference-level wireless audio is all about.

Troubleshooting steps
Does not work well with PC: Enter the computer settings and enable the mic. Disable all the other devices and set the headphones as Default Device. If the PC has a built-in Bluetooth, please try to install the Toshiba Bluetooth stack (choose the newest one or whatever is recommended online).If you use a Bluetooth dongle, you may need to buy a CSR 4.0 Bluetooth adapter, the CSR 4.0 Bluetooth adapter would work perfectly with our headphones.
No sound or one side has no sound: Please try to reset the headphone: Power on the headphones.Charge the headphones for 10 seconds or so, the headphones would power off on their own(you can see the LED goes out), unplug the cable.Power on the headphones again.And remove the pairing memory of your device,then pair again.

Specifications
Bluetooth version: Bluetooth 4.1
Supported profiles: A2DP, AVRCP, HSP, HFP
Drivers: 50mm x 2 ; 20mm x 6
Impedance: 32Ω
SPL: 120 dB
Frequency response: 5Hz -25000Hz
Wireless range: 30ft (no obstructions)
Music time: about 25hours
Charging time: 3 hours for full charge