They can do well in the electric project; You can put it on a blank board with multimeter. The dual voltage (5.0 and 3.3) make these an good addition.
These are initial material for bread boarding projects, you can put a piece of adhesive foam on the underside of the board, and that fixed it.
Fit for: MB-102 breadboard; Fits well into the power rails on either side of a standard breadboard, and gives rock-solid power.
Input voltage: 6.5-9V (DC) or USB power supply
Output voltage: 3.3V, 5V switchable Maximum output current: <700mA
Two-way independent control can be switched to 0V, 3.3V, 5V
Onboard two 3.3V, 5V DC output pin