Had a buddy come over & ask a question about his really old pre laser V1. He said it does not pick up TX DPS cars unless they are shooting K. Knowing they use mainly Stalkers I said no problem, I will grab my Stalker ATR & check his radar. Surprise! The old V1 stayed silent & never picked up the Stalker at all. Not a peep. Forgot to see what software he has but he did mention it picks up Ka on on other patrol cars not using the Stalker. A good not to people using really old V1's. You might be driving naked.