The CueCat is a perfect device to hack. The hardware can be modified in a number of ways, ranging from altering or removing the unique serial number assigned to each device to converting the CueCat to read plain old barcodes of virtually any kind or ripping out the guts and making a CueCat-based flashlight. Although the company, DigitalConvergence, no longer exists, the CueCat has arguably become the most popular hacked and reverse-engineered hardware device to ever hit the mainstream market. There are three major varieties of CueCat—PS/2 keyboard interface, four-screw model; PS/2 keyboard interface, two-screw model; and USB interface, two-screw model. The overall functionality is essentially the same for each of the models. Each model also has subvariations of component types and manufacturing processes.