I have a DX4050 and found compatables rubbish. The only ones I use are Jettecs,
which are available at reasonable prices if you google it. They have 90% longer life to than originals.
Can't fault them... or the DX4050 come to that.
Dell XPS 13 9370 (2018) review
Creative studio Omnibus' brand identity for We Said Enough, a non-profit against sexual misconduct
What to ask Siri on the HomePod
Meilleurs VPN (2018)