Theses displays have 4, 6 or 8 digit 7 Segment LED displays. The device is powered and controlled via the USB port. Red and Green LED colors are available. Data can be entered in three modes; raw, hex and ascii. Device has programmable flash rate and optional piezo buzzer is available on 6 digit display only. Simple plug and play technology. Comes with 2M USB cable with USB B connector. Item with -M suffix have a miniUSB connector on the PCB. Items with out the -M have the USB cable soldered to the PCB. Unique serial number in each device. Example software available in C, VB, C# and VB.Net.