The mKaart is a plastic chip card in a credit card format. You can top up this multifunctional card electronically with tickets which are valid on the entire Luxembourgish public transport network.
A single mKaart chip card can be topped up with several tickets of a same category (e.g. several short or long duration tickets or several season tickets or other tickets).
You can also use your mKaart for the mBox.