A point-of-sale (POS) system is provided. The POS system may include an adjustable housing configured to receive a computing device. The POS system housing may be adjustable so that a screen of the computing device can be viewed by a merchant and a customer. The computing device may be removable from the housing for use as a mobile POS system. The POS system may also include electronics for accepting various forms of payment and for connecting the computing device to a network.