Speed limiters can be installed in cars, buses, school buses, trucks, garbage trucks, tankers and so on.It can control the speed when you are speeding. Features: (1). Function: speed limit. (2). Speed range: 10 ~ 120km / h. (3) speed limit deviation: ± 1km / h. (4). Product operating voltage range: 9-28v. (5). Use temperature: -35 ?? ~ 80 ??. (6). Rated power consumption 2w. (7). Applicable to all kinds of vehicles Technical parameters 1. Application temperature: -35 ?? ~ -50 ??, relative humidity of not more than 90%     should be able to work properly Speed range: 10 ~ 120km / h. Speed deviation: ± 1km / h 4. Product operating voltage range: 9-28v Temperature resistance: -40 ?? Temperature resistance: + 85 ?? 7. Anti-vibration performance indicators: frequency 20-50hz acceleration 1g 8. Electromagnetic compatibility: the group of pulse voltage 4000v 9. Power consumption 2w