'Trådlös' is the usual way to say it. Though arguably '-lös' (-'less') could be construed as having a negative connotation, whereas '-fri' ('-free') has a posit

'Trådlös' is the usual way to say it. Though arguably '-lös' (-'less') could be construed as having a negative connotation, whereas '-fri' ('-free') has a positive one. That's probably why they went with 'Trådfri'.