Package include: - 3x3 inch copper clad PCB - 1 Piece, BC 547 Transistor - 1 Piece, 5mm LED - 1 Piece, 9v Battery with cap - 1 Piece, 1 k ohm resistor - 3 Piece, 10 k ohm resistor - 1 Piece, LDR - 1 Piece
Transistors are silicone planar epitaxial NPN type transistors.
A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity