11. A miniature toggle switch with solder lug connections. The switch should have a contact rating of more than two amps (Radio Shack #275-635B or equivalent). Only two contacts or single pole single throw (SPST) is needed on the switch to turn power on and off. If all of your servos and sensors connect to the UP3 and do not use the Vunregulated supply, you could eliminate the switch by using the UP3’s power switch.