| Component Name | Number | Parameter | Remark |
| Universal PCB board | 1 | Double-sided and single-hole plate | / |
| Battery Holder | 1 | No. 5, no cover and no switch | / |
| Battery | 4 | No.5 (1.5 V/PCS) | Four batteries are connected in series to provide 6 V DC power |
| Twist Switch | 2 | Single row, 3 pin 2 gear | The middle end is the input terminal, and the two ends are the output terminal |
| Switching Diode | 2 | 1N4148, General application, high switching speed, low current, VR: 75 V (max), IF: 150 mA, VF: 0.62 V (IF = 5 mA) | Low price and easy to obtain |
| Resistance | 1 | 3.3 K, 1/4 W color ring resistance | / |
| LED | 1 | Straight plug Φ5, VF: 2 - 2.2 V, IF: 20 mA | The normal working current is small, low price and easy to obtain |
| Wire | / | 28 AWG, red, black | / |