V3.0 + EDR Bluetooth version, available for most devices with Bluetooth function.
there are 2 headphones on both sides of the hat!
 knitted material, fashion and keep warm with answering the phone in the winter.
Set-in MIC, available for cell phone to transmit the talking phone to your audio devices directly so that the user can hands-free answering machine via the device.
Set-in Li-ion rechargeable battery, charge via USB cable, long stand-by time.
charge the battery receiver display on for iPhone.
when you want to wash the hat, just take the Mother Card from the hat
which is size Free of the hat
specification:
 Bluetooth: V3.0 + EDR
 frequency: 2.4026 GHz-2.480 GHz
distance from Transmission: 10 M
Remote MIC Transmission: ≤1 M
Li-ion Battery: 180mA
charging time: 2.0 hours
standby time: up to 18 hours
continuous working time: approx. 3.5 hours
package:
1 x Bluetooth Hat