The CMP-30 printers are designed like all Citizen printers...simple to use and easy to operate. This, combined with the durable, strong plastic case which is designed to take the occasional knock, means our printers keep running and running. The CMP-20 and CMP-30 feature high capacity media rolls which can accept large diameter media rolls of approximately two inches, allowing for long print runs without changing the media. Furthermore, they come equipped with high capacity batteries, providing users with day-long printing capabilities. Compact, robust and powerful, the CMP-20 and CMP-30 printers are ideal for all your receipt and labeling needs.