Premium Female/Male 'Extension' Jumper Wires - 40 x 12" (300mm) Category_Sensors/Magnetics There are three slots and

There are three slots and you can sort of eye-ball which one will fit your contact best

When you need some help driving a lot of LEDs

Not sure which XBee module or accessory is right for you

and the higher the input voltage the hotter the regulator will run

making it much easier to control

Premium Female/Male 'Extension' Jumper Wires - 40 x 12" (300mm) Category_Sensors/Magnetics There are three slots andHandy for making wire harnesses or jumpering between headers on PCB's. These premium jumper wires are 12" (300mm) long and come in a 'strip' of 40 (4 pieces of each of ten rainbow colors). They have 0. 1" male header contacts on one end and 0. 1" female header contacts on the other. They fit cleanly next to each other on standard pitch 0. 1" (2. 54mm) header. The best part is they come in a 40 pin ribbon cable. You can always pull the ribbon wires off