<3 Good morning. I think I can answer that. The Alpha cards were designed specifically for mobile phones. It slides in right behind the protective case.
I currently have one in my iPhone 6. The card has turned me into a Candy Crush monster! Charging times are faster....the Ebay app, in fact all apps are much much much faster. The phone runs cooler....
The headphone people will love them as much as I do! ( Walkman's too, Geoffkait.) The first of it's kind! Other people have mentioned placing the Alpha....virtually any place you can put an E-mat.
Remember, the card is NOT a magnet, but it's also not as a powerful as an Omega E mat. Available soon..... should be great fun! <3 Krissy