This is a simple jumper adapter cable that comes pre-terminated with a female JST connector on one end and a breadboard hookup pigtail on the other. This cable makes it easy to connect components with a JST connector to a breadboard or an Arduino-based device's pins.
Wire length is 140mm (about 5.5 inches) long. The adapter's wires have been color coded to Red, Black, and Yellow. Additionally, the female JST connector featuring a basic 2mm pitch while the male hookup pins can easily insert into a standard 0.1" connector.
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I have one of the older PIC based LCD displays that Sparkfun sells. These use 5 volts, and have a 3 pin JST connector on the board. This cable allows me to attach that LCD display into a breadboard circuit. Of course, the breadboard pins also work directly into the female header connectors on an Arduino. So it allows one to easily use an LCD display without a breadboard, if that is all that is needed. It is a special use case, but when you need it, you need it!