4.0 SMART CHIP,EFFICIENT TRANSMISSION SPEED.COMPACT, ULTRA LIGHT DESIGN STEREO BLUETOOTH HEADSET, PORTABLE AND EASY TO CARRY.HIGH-FIDELITY SOUND QUALITY, WIRELESS SONGS ENJOYVOICE REPORT NUMBER, LOW POWER REMIND,CONNECT/DISCONNECT REMIND,BOOT OFF PROMPTS.ALLOWS YOU TO CONVENIENTLY ANSWER CALLS WHILE DRIVING.SUPPORTS TWO MOBILE PHONES SIMULTANEOUSLY CONNECTED.LONG BATTERY LIFE, FAST CHARGING.SUPPORT WECHAT, QQ VOICE CALLS,MOVIE,BLUETOOTH V4.0, SUPERIOR COMPATIBILITYCOMPATIBLE FOR ALMOST ALL THE MOBILE PHONES AND TABLET PC, ETC.SPECIFICATION:1. DRIVE: 40 MM2. IMPEDANCE: 32 OHM3. BLUETOOTH VERSION: BLUETOOTH V4.0 EDR4. POWER LEVEL: CLASS II5. OUTPUT POWER: 30MW6. BLUETOOTH DISTANCE: 10 METERS BARRIER7. FREQUENCY RESPONSE: 20-20000 HZ8. OPERATING VOLTAGE RANGE: 3.0V-4.2V9. MICROPHONE SENSITIVITY: -42DB10. WITH A2DP / AVRCP HIGH-QUALITY STEREO AUDIO TRANSMISSION AND REMOTE CONTROL PROTOCOL11. POWERFUL NOISE NOISE CANCELLATION CIRCUIT (ACTIVE NOISE REDUCTION)12. WIRED AND BLUETOOTH AUTOMATICALLY SWITCH TO SUPPORT AUDIO INPUT13. CHARGING TIME IS ABOUT 1 HOUR (POWER INDICATOR CHARGING: BLUE LIGHT LIGHTS, FULLY CHARGED: BLUE LIGHT GOES OUT)14. DIMENSIONS: DIAMETER LENGTH 20MM. WIDTH 15MM. 18MM HIGH15. WEIGHT ABOUT 4G16. TALK TIME ABOUT 4 HOURS17. MUSIC FOR ABOUT 3 HOURS18. THE STANDBY TIME IS ABOUT 3-4 DAYS19. CHARGING POWER: DC5V POWER INTERFACE [THE HOLE] (COMPUTER USB PORT, MOBILE PHONE CHARGER, CAR CHARGER) 20. COMPATIBLE: COMPATIBLE WITH ANDROID, APPLE, MICROSOFT, SYMBIAN 99% OF WITH BLUETOOTH CELL PHONES(IOS CELL PHONE HAS POWER DISPLAY)PACKAGE CONTENTS:1 X BLUETOOTH EARPHONE1 X USB CABLE1 X USER MANUAL