1.Product features: (1). Function: limiting speed. (2). Speed range: 10 to 120km/h. (3) .Speed limit deviation: ± 1km/h. (4). The operating voltage range of the products: 9-28V. (5). Application temperature:-35 to 80. (6). Rated power consumption 2W. (7). Apply to all kind of vehicle 2.Technical parameters 1.Application temperature:-35 to -50, relative humidity is not more than 90% should be able to work properly. 2.Speed range: 10 to 120km/h. 3.Speed limit deviation: ± 1km/h 4.The operating voltage range of the products: 9-28V 5.Low temperature resistance:-40 6.Temperature resistance: + 85 7.Vibration-resistance performance indicators: frequency 20-50HZ acceleration 1g 8.Electromagnetic compatibility: the Group of impulse voltage 4000V 9.Rated power consumption 2W