Mobifren GBH-M100 Mono Bluetooth Headset Dual microphone for clear call quality, to eliminate surrounding noise Foldable design and Smart connection: Just fold the headset for incoming calls. It connects to call automatically. Auto Call Lock: Prevent unintentional call by unfolding the headset Portability: Easy to carry the headset by hand strap type Bluetooth range up to 10 meters (33 ft).