This Arduino Starter Kit walks you through the basics of using the Arduino in a hands-on way.

The TL431A is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges.

The LM317L device is an adjustable, 3-terminal, positive-voltage regulator capable of supplying 100 mA over an output-voltage range of 1.25 V to 32 V.

This is a SMD 4 pin right angle male header.

This is a SMD 6 pin right angle female header. 

These headers are made to work with the Arduino Uno R3, Leonardo and new Arduino boards going forward.

The LiPower board is based on the incredibly versatile TPS61200 boost converter.

The NCP1402 is a 3.3V DC-DC converter. 

This is a common barrel-type power jack for DC wall supplies. 

This LilyPad Coin Cell Battery Holder has a small slide switch installed on the board, in-line with the power so you can shut off your project and save batteries.