It's a low power device (35mw), but it's in a radiolocation band, so they had to get a wavier from the FCC. That's an interesting read, because it lists the uses. They're getting surprisingly good range for only 35mw radar power.
The patent is for a different device - that's for a better version of those wands used in security screening. The approach is similar, but the power is much lower.
https://apps.fcc.gov/edocs_public/attachmatch/DA-09-2482A1.p...
The patent is for a different device - that's for a better version of those wands used in security screening. The approach is similar, but the power is much lower.