With a built-in rechargable battery the Holux GPSlim 240 provides enough power to last for a full day's walking should you decide to take it into the hills...It communicates with other electronic utilities via Bluetooth, USB-compliant interface, and has a built-in rechargeable battery to save such satellite data as the status of satellite signal, the last location, and date and time of previous...

it stands longer than 6 hours, and it comes with the car charge with USB cable...Signal lock is good - outside of urban canyons, I get signals quickly and they remain relatively precise...Otherwise, I recommend this unit if you want a very small but very capable GPS BT receiver...