There are two primary types, laser and tradition (Doppler) radar. Even if you have a radar detector, laser is the most difficult type of radar to avoid getting caught by. Laser radar gives officers a near instant reading on your speed, so you don’t have time to slow down before they get a reading on you.
Your best defense is prevent the laser beam from bouncing back to the radar gun. The front license plate and your headlights are the most reflective thing on the front of most vehicles. If you’re not required to have a front plate in your area, get rid of it.
The next best thing is laser jamming, although it’s not legal in all places. But, if it is allowed in your area then you can buy laser jamming or scrambling units which prevent the radar gun from receiving a laser signal that it can use to measure your speed.
If laser jammers are not allowed, you have some other options. You can get plate covers and headlight treatments to help reduce the amount of laser light that is reflected back to the radar gun.
All of these tips should help you avoid some speeding tickets.