In to introduce the data (data entry) a remarkable part they have the decoders in emulation of keyboard, such decoders don't have software need because they emulate to all the effects the keyboard and any read datum is like if it quickly were digit on the keyboard. Of decoders exist of compact as a walnut and others that offer options of connection what magnetic readers, readers of bar code of any form and performance, readers and portable terminals, balances and other regulating serial.