Features & Benefits
- Includes 40pcs set: 10pcs of 3V and 10pcs of 5V laser dot modules, plus 20pcs photoresistors GM5539.
- Easy to use: just connect to any 3V or 5V power supply, perfect for beginners.
- High-performance laser: creates a clear, bright red dot over long distances.
- Photoresistors feature high light sensitivity for quick responses to light changes.
- Durable materials: made from pure copper for longevity.
- Versatile applications include student experiments, electronic toys, projectors, and security systems.





