Abstract: Point of sale devices are disclosed. A register point-of-sale system may include: a register base; a customer screen that is removeable received by the register base; a merchant screen adjustably mounted on the register base; and a card reader integrated into the customer screen. A mobile payment terminal system may include: a mobile payment terminal comprising a wireless card reader, magnetic stripe reader, slot that receives a chip card, a screen, and an integrated receipt printer; and a dock that removably receives the mobile payment terminal. A mobile card reader system may include a cylindrical mobile card reader comprising a screen, a wireless card reader, a magnetic stripe reader, a slot that receives a chip card, and a plurality of base slots that receive a plurality of base latches; and a cylindrical base with an angled end and latches.