Review on 🚗 Universal Wireless Car HUD Head Up Display: Speedometer MPH, Solar/Battery/USB Charged, Time Clock, Speed Alarm, Fatigue Driving Alert, Temperature & Altitude by Julian Rash

Great little unit for the price. Solar charging seems useless (even if it's installed on a car's dashboard in the middle of summer), so I left it plugged in while using it. What's really annoying is that the unit switches from MPH to KPH every time it sees a 12v charge signal so you have to reset it every time (I bought this for an imported car that I put in the USA since the speedometer is only in KPH ) start the car (if your cigarette lighter turns off when the car turns off). However, I recommend the product for its small size and price.