I might be completely wrong but from what it looks like on the Maplin website the tweeter is actually 85W (i.e you can feed it with 85W of power, a pretty sensible figure for a tweeter). I think the 600W its referring to is when you’ve got it connected to the IEC 268-5 crossover mentioned on the webpage, so if you’re building a cabinet with 2 drivers in it, u can feed the cabinet with up to 600W without burning out the tweeter. The Maplin description is misleading, probably on purpose to make the thing seem more powerful than it actually is.