Easy hookup to your Arduino or other 3-5v micro controller. Pulse current through a PWM pin, and use this to control a pump, LED, or other DC device at up to 24v, and ~5A.
5.5mm x 2.1mm DC Power Female Jack Adapter Plug Connector
5.5mm x 2.1mm DC Power Male Jack Adapter Plug Connector
2x AA Double A Battery Holder With Switch
Plastic Battery Holder Storage Box Case for 1x 18650
Plastic Battery Holder Storage Box Case for 2x 18650