Review on 🚗 CARLOCK - Next Generation 3G Car Tracker & Alarm with Advanced Real-Time Tracking. Includes Device & Phone App. Effortlessly Monitor Your Vehicle in Real Time & Get Instant Alerts on Suspicious Activity. OBD Plug & Play. by Daniel Morris

Bought this to keep track of my teenage driving. On her very first day driving alone, I received a warning that she was driving at 43mph in a 25mph zone. She would lose her driver's license for several months until I took a closer look at the card. It showed her driving in a straight line through the middle of the blocks, with her final destination a few blocks further than where she actually parked. (I drove by and checked) I assume he calculated the speed based on the imprecise distance travelled. Regardless, it showed how inaccurate it can be on the very first day of use. Knowing this, I can't trust a single read to render it useless - and DEFINITELY not worth paying for a monthly subscription.