cassette salt . 2.5 volt flashlight bulb Patronize beetle Depletion
Source Physical electricity experiment 2.5V small electric beads small round bulb old-fashioned flashlight E10 toy miniature light bulb on m.alibaba.com
10x E10 2.5V / 0.3A 0.75W Miniature Screw Base Bulb Lamp Flashlight Torch Work Light Experiment (Box of 10) : Amazon.ca: Tools & Home Improvement
VILLCASE E10 Miniature Light Bulbs, Old-Fashioned Flashlight Lamp, 10pcs Screw Base Indicator Light Bulb, for Physical Electrical Experiment Screw Base Indicator Light Incandescent Bulb (2.5V, 0.3A) : Amazon.ca: Tools & Home Improvement