Description Note: bluetooth is for one ear, not pairs. Product specifications: 1. Hold the power button for 3 seconds long (Until the red green light flashes) to let the headset play a bluetooth signal (If the blue light is displayed, keep holding the power button until the red light flashes red). Then turn on bluetooth phone and pair. 2. Press the button to stop or continue listening to the music 3. To receive a call when the bell rings, press the power key to receive, hold or discard a call 4. When not in use, hold down the power key until the red indicator light turns off the headset 5. To charge the battery, the customer should use 1A output charger 5. Bluetooth version: V4.0 + EDR 6. Impedance: 32 Omega 7. Sensitivity: -42 dB 8. Frequency range: 20 - 20K Hz 9. Transmission capacity: Class 2 10. Transmission range: 10m 11. Radio frequency: 2,402 - 2,480G Hz 12. Colors: White, Black, Pink, Blue, Yellow 13. Music time: 1-3h 14. Talk time: 2 - 4 h 15. Standby time: 120 hours 16. Charging time: About 2 h 17. Battery type: 50 mA rechargeable polymer battery 18. Output power: 30 mW 19. Electrical system: AC110-220V / DC5V 20. USB cable length: about 5cm 21. Dimensions: about 16 * 15 * 28 mm / 0.63 * 0.59 * 1.10 inches