Good quality,reasonable price, prompt delivery,good after-sales service We are professional educational equipment manufacturer and global supplier of various of physics experiments.Device configuration1. Diode2. Transistor3. Photocell4. Thermistor5. Photoresistor6. Resistor (360 Ohm)7. Variable resistor (470 Ohm)8. Lamp (3.5 V, 0.25 A) The "Electricity 2" Demonstration Set