Features:Designed with overspeed alarm, is more safer for reminding.It helps to show travel speed, local time.Digital head up display design, is more accurate.Suitable for most cars' usage.Digital head up display design, helps display simultaneously.Descriptions: Working Temperature:-40 to 80Speed Ranges:0-158MPH / 0-255Km/hrAlarm sound level: 30dbAtmospheric pressure:86-106kpaSpecifications:Model:A3Input voltage:8-18VWorking current:40mAItem Size:8.8*5.3*1.3cmPackage Size:17*13*4cmColor:blackMaterial: ABSPackage Included:1 X Head Up Display1 X User Manual1 X Non-Slip Mat1 X OBD Cable1 X Reflective Coating Notes:Please allow slight dimension difference due to different manual measurement.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.