I just returned from a friends house, he just received and installed an external speaker from Escort on his BMW along with an Escort detector. It's only 25.00 which is much less than the Radar Screamer. This thing is loud it will get your attention right now. Only downside is it's not waterproof, but you could probably install it where it would be shielded from the elements. The audible alert will get your attention right now there is no possibility of overlooking the sound. I find visual alerts to be damn near worthless.