Beltronic cordless radar detector
I had not had the problem with the auto shut down. There is enough motion while normal riding to not to worry about that.
However, it tends to eat batteries, so I buy them at Costco, a large pack and leave some spares in my tailbag.
I have 3 jackets that I wear while riding, depending on the weather. For my leather jacket, I had the seamtress sew a leather pocket on. My Nylon Winter jacket and my summer jean/kevlar jacket both already have breast pockets.
It problaby doesn't have the range of the upscale detectors like passport or Valentine, but it is a much easier installation.
Hope this helps