INTRUDER ALARM ROBOTBuild an intruder alarm robot and learn how a circuit works. It keeps any unwanted intruders out of your room. SKU: 4900 Categories: 4M, Steam powered Kids Description 8+Related products 4M – DIG A TRICERATOPS SKELETONContains a triceratops skeleton about 20 cm tall when assembled. 4M – MAGIC SETPerform your own magic show. Amaze your friends and family with the 12 magic tricks included in this kit. 4M – CRYSTAL MINING KITExcavate your very own crystals. Add them to your rock collection. The kit contains natural crystals of various colours. You’ll love this cool mineral rock digging kit.