They don't have visible wires at all LOL
All you can see with the other kinds is the piece of tubing (which is so fine, you can't feed fishing line into it - cos my husband and son in law tried all afternoon one day, sat on the bank not catching any fish lol) NB these were used bits of tubing, only destined for the bin! leading from the pump itself (mine's 8cms x 4.8cms x c.1.5cms - in my pocket at the mo) to the cannula attached to me, like a thin white oval sticking plaster, with a bit of transparent superstructure on the top surface of it. Cannula's currently stuck to my left thigh, so the only visible tubing is what comes out of my pocket and disappears again under my T-shirt hem into my trousers waistband, when I had my cardi on earlier - couldn't even see that bit.
Steph - remains to be seen how you get on with doors with it on your arm! If I can literally wrench a Libre sensor completely off in a door after it had been there 10 days already (so very firmly stuck!) high up on the back of a shoulder - I'm bloody sure I'd do it much easier with a Pod ! LOL