The product is made of materials with guaranteed quality product design, simple welding, and wide application scenarios It is very suitable for DIY electronic beginners to learn welding, electronic training, handcrafted gifts, etc Shipping as loose parts requires self assembly, which can improve hands-on ability After soldering the insect's eyes, test the functionality of the circuit board by placing the 20mm button battery face up into the battery box. If the light is dim, you should see the LED light on. If not, please cover the sensor with your fingers for testing. If the insect's eyes don't light up, please don't worry! Starting with some simple questions, check your solder joints to good connection between your components and the circuit board. The solder should flow into the inside of the circuit board and not bounce around the component pins. Also, check to that the direction of the istors and LED lights is correct. It's DIY kits, needs to finish by yourself. Color: Green Material: Plastic+Metal Package Contents: 1 * light set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.