The PD20 is an add-on module that transforms Zebra compatible tablets and handheld mobile computers into mobile point of sale (mPOS) terminals. The PD20 solution can be added to already compatible devices or purchased with new devices that already have it. Retailers can now make purchases anywhere in the store with payment enabled. Validation and ticket purchases on buses, light trains, and subways are made possible by transit operations. When visitors arrive at the hotel, check-in and check-out can be completed. At the customer's location, delivery drivers can accept payment.