This is a 5V/2A USB wall adapter. The input is AC 100-240V.    Note: It doesn't come with a USB cable.

This is a fixure/organizer used to organize your jumper wires during prototyping. It has a double side tape to be fixed onto breadboard or acrylic board.

This is a DC to DC step up module.    Interface: IN+: Positive of Input terminal IN-: Negative of Input terminal OUT+: Positive of Output terminal OUT-: Negative of Output terminal   Specification: Input voltage range: 3.5V...

This is a mini 2-wire voltage meter that can be used to measure any DC voltage than ranges from 2.5 to 30 V. The RED wire is connected to postive, and black is connected to negative.         

This is a USB microscope with 5 megapixel. It comes with 50x and 500x magnification. When you plug it into your PC, your PC will automatically recognize it and load the necessary drive.  Package comes with a USB microscope with 4.5ft/140cm long...

This is a mini AC power meter that can be used to measure the power efficiency of appliance.  Specification: Voltage: AC85-250V Measured power: AC 0.0 - 99.9W - 250W Resolution: 0.1W (< 100W), and 1W (> 100W) Current: <...

These alligator clips are useful  for smaller wires that you don't want to deform. The clip has smooth  flat metal blades that clamp down on the wire, making for a good  connection to thinner wires. There are strain relief crimp points and...

This is a 9V battery snap with barrel connector, works perfectly to add a 9V battery to your Arduino USB board. Center-positive 5.5x2.1mm barrel connector.