Key Box II? anybody using it?

[s1tl]

Hi sifu sifu and bros of ZTH,

I was reading hypertune just now and i saw this Key Box II, i wonder any body using it on their keys?
i searched and only found kaitenaz racing doing it for toyota vios...
wonder E36 BMW key can use or not =(

looks smth like this

http://d2m2.myweb.hinet.net/pic/k2_right_retractable.jpg