A checkout where customers scan and pay for items themselves; essentially synonymous with self-checkout/automated checkout.
セルフレジは使い方が分かればとても便利だ。
Self-checkout is very convenient once you know how to use it.
初めてセルフレジを使うときは、店員に操作を教えてもらおう。
When using a self-checkout for the first time, have a staff member show you how to operate it.
セルフレジでは袋の有無も自分で選べます。
At the self-checkout you can also choose whether to have a bag.