The Adapter, 16V @ 500mA is a economical power transformer that supplies 16V at 500 mA output.
6 Vdc, 1.5 Amp power supply with center positive polarity.
This Switching Power Supply brick offers 12V up to 3A DC from up to 240VAC input
This kit includes 3 female and 3 male DC power connector plugs. Each plug is high-quality, brand new and professional for CCTV installers and excellent for all other AC/DC power applications. These plugs are perfect for extending the range of power applied to your Arduino.
This is a VERY common regulated 12 VDC 2000mA output power supply used for many common gadgets.