MS-440 PVG CIRCUIT BOARD DEMONSTRATION

A safe, economical and a real working circuit board with wires,
light bulbs to teach students the concept of electricity, series,
circuits, switches, voltage, current, resistance and other concepts
important for electricians and others in the field. Requires (4)
“AA” alkaline batteries (not included), Includes a circuit board,
four battery holder with output 1.5,3,4.5,6V and three bulbs,
two way key, wires, Rheostat switch, buzzer, fan, On-Off switch
and working manual