Do NOT use these devices. I had one from Progressive thinking they would save me a few bucks. It gave me headaches because I had to call them on the rate increase I noticed on my bill. They said I had three hard brakes in a month which made me a “higher risk” driver. I knew exactly what events (the device also beeps at you when event occurs) which weren’t my fault. Other driver turning into my lane, two pedestrians hopping into the road (scammers) No ifs ands or buts, if that fucker beeps telling you you braked too hard; tough shit.