through bluetooth technology,it transmits satellite navigoction information to the portable devices with bluetooth function such as notebook.pad.mobilephone ,ect. the bluetooth gps receiver jd-bg008 features super slim,liglt weight and portable.it can receive up to 16 satellites'information at the some time.positioning sensitivity around 3 or 5 meters. it supports externel antenna.with its powerful lithium battery. it can work continuously up to 15 hours.if not enough. it can also be powered with its accessories such and travel charger; the jd-bg008 simultaneously support carkit hfp support echo cancellation