They don’t specify what the lines represent.
I tried to order one, they try to upsell packs and by default includes a 3D printed case and (as usual in US) does not include VAT. So I think it ended up with ~38 EUR for one.
It also requires a (proprietary?) app for Android/iOS.
The website broke at https://chargie.org/checkout/ and I could not fill in S&H or payment details. So beware ordering on phone (I was using Firefox).