Radar and laser detectors are obsolete. Get Waze navigation app for your smart phone. You will see police marked along your route long before any detector will tell you. I drive A LOT for work and use Waze every day. I routinely see police marked on my route and when I pass the spot, they aren't there..... they are getting out of their patrol car 1/4 mile up the road about to write someone a ticket. Many other times I see them hiding right where they are flagged. I had radar and laser detectors for years and have given up on them since the invent of this app.