What is a harbortouch skytab system and its working in detail At some point, we have all come across different POS devices, but there is no doubt that they have different definitions than POS devices. Some people are confused about this. Is a payment machine just an ATM? Or is it a computer at the billing and payment counter? The harbortouch skytab is a device is used to collect personal payments from customers. In general, the point of sale includes a cash register, depending on the system used in the store. Every customer who purchases a service or solution from the store completes the transaction at the point of sale, so the point of sale system can be considered as the endpoint of the purchasing process.