i give it four stars because apparently the company never made drivers for this? ive spent hours trawling the web looking. in a dell laptop windows only sees a(n unusable) bluetooth, and a network device. apple sees it as a bluetooth NULL device. im stumped. i really want to use it, but oh well. very fast shipping, however... it arrived before the tracking updated! i don't think it's the sellers fault, but i think this may be bootleg hardware!