Hardware. These are stand-alone devices that can accept cards and print receipts. Such CRM

 can operate independently from a battery or from a constant power source.

Software. This is the case when you buy a program and install it on any device: laptop, tablet or smartphone. For example, Smart Online CRM and Webkassa applications have full-fledged cash register capabilities and work on a smartphone. A cash register in a mobile phone is an ergonomic solution with full functionality of a traditional cash register.