OfficialParts Specialist Since 2016 Trusted by 120,5656+ European drivers, explore our certified accessories collection directly from the seller profile. For the power supply or satellites memory issues, it might take 1-5minutes to start up. When it connected with satellites, you'll see the current speed on the screen. When you're in tunnels, basements or the area bristles with buildings, it might not connect with signal of satellites well. Please drive carefully, it will re-connect automatically while you left these places. For safety reason, please do NOT operate this product while you're driving. The best way is to adjust this product before you drive your car. Every instruction of this product will be pronounced by human voice. All the technologies should be applied wisely, not depend on them overly. Please read this user manual carefully before you operate this product. Operate this product correctly. The goal of our product is to assist you to drive more safe. Therefore, we strongly recommend you to follow the traffic laws to drive. Wish you have pleasant and safe journey.