Product Information Operating frequency range ISM2.4GHz to2.4GHz Bluetooth Profile Speakerphone & Hands-Free Profiles transmit power Class2 Bluetooth specification standard Bluetooth Version 4.0 + EDR wireless connectivity range of 0-10 m charger output specifications DC5-6V 650MA 3.7V Built-in rechargeable battery 650MA normal charging time of about 3 hours hands-free talk time of about 12 hours of standby time of up to 500 hours / 20 days handsfree size 12CM * 2CM * 7CM (excluding clip) Weight 70g features a full Chinese language prompts 2, support music Play 3, 4 support calls dialing, dual speaker design, better call 5 to support a mobile music player key 6, to drive the process, easy to receive and make calls, to ensure traffic safety 7, can automatically recognize a mobile phone, do not need cable or telephone line and mobile phone cradle can; 2