If LEDs on your device don't light up on ignition on after plugging in the device, you most likely have a blown fuse to your OBD port. The port usually shares power with the cigarette lighter/accessory fuse. If the fuse is okay and the device still isn't powering on, the device might be faulty.
If you still have a problem, please contact us at 1-806-855-8255 or customerservice@forcefleettracking.com