The QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following applications. This sensor is sold in packs of two units.
This rainbow jumper bundle is quite handy for making a color-coded wiring harnesses. It's also suitable for all kinds of 0.1" spacing applications like breadboarding or connecting between headers on PCBs!
The iMax B6 Balance Charger accurately balances and charges Lithium Polymer, LiFe (A123), NiCd and NiMH batteries. The B6 will balance charge LiPo/LiFe up to 6S and NiMH/NiCd up to 15S and shows individual cell voltage during charge with realtime updates throughout the charge cycle.
It's a microcontroller kit. It's a 3 watt RGB LED kit. Put into a blender with an appropriate amount of solder and love, it turns into a microcontrolled Northern Lights RGB Bundle! This little guy can produce greens, violets, and teals that make you feel like you're north of the 49th parallel.