Specifications: 1. Blutooth standard: Blutooth V3.0+EDR， Class 2:33' 2. Transmission distance: 10m 3. Hands-free 4. Stereo audio profile: A2DP 5. Frequency: 2.4GHz 6. Certified BQB， CE AND FCC 7. 3.5mm stereo audio output 8. Sleep mode for power conversation 9. Power supply: Chargers via mini-USB cable 10. Operation time: up to 8 hours