I ordered what was advertised as a uses NXT4a. It didn't come with a charger, so I can only assume either they misrepresented the bass and it's older with a passive pickup or it's missing a charger. I believe the charger of an NXTa plugs into the input jack so, that is no discernible indication. If it is an NXTa, then I can just buy a charger, but I don't want to buy one if I don't know. Thanks in advance!