Yes. Your Neno account works across the entire SEPA zone (36 European countries) for euro transfers at no extra cost. Your Neno card (Mastercard) can be used for payments and ATM withdrawals worldwide wherever Mastercard is accepted.
A few things to keep in mind when using your account abroad:
SEPA transfers work the same as domestic transfers within all SEPA countries
Card payments in non-euro currencies will involve a currency conversion. Exchange rates and any applicable fees are shown in your transaction details
ATM withdrawals abroad may be subject to fees from the ATM operator
Contactless payments (including Apple Pay and Google Pay) work internationally
There's no need to notify Neno before traveling. Your account and cards work internationally by default.