Questions for Dodge hotspot purchasers/ users. - If I take my computer or device away from the car, how far can I go before I lose connectivity with the car's hotspot wifi transceiver? - Does the car need to be running to enable the transceiver? Engine running or just (battery) power on? - Any problems in general to be aware of? I am considering using it short term for static, parked car scenario, very light internet usage. Not for streaming music and video. Much less intensive use.