Bullet Points: [COMPLETE CIRCUIT]:Comes with one instructions 5 x crocodile clip leads 5 x bulbs 2 x motors 2 x motor holder 2 x rocker switches 3 x propeller with 3 Vanes 3 x propeller with 4 Vanes 1 x buzzer sounder 1 x bulb holders AA size battery holder (1 x 1.5V) AA size battery holder (2 x 1.5V) packaged with enough circuit accessories for you do science project easily. [SCIENCE EXPERIMENT]:This popular and interesting electronic science experiment STEM toys can well inspire and encourage kids learning about science. This Montessori learning toy is good for curious kids turning your own new ideas and inventions into reality. Also perfect for Children s school science STEM engineering projects. [WIDE APPLICATION]:The circuit motor kit can well catch kids attention and let the them try to build experiment and explore basic electrical simple circuits. It can also be used in school in science STEM technology and design courses easy to meet your project needs properly educating some circuit knowledge would be a good interaction time with your kids together. [NOTICE]:It is recommended that the voltage be 1.5V-3V. If the voltage is 3V please control the time. The use time should not be too long and the time should be controlled within 3 minutes. After 5-10 minutes the circuit will generate heat and a short circuit. [WARNING]:Suitable for 8+ years. CHOKING HAZARD—Small parts not for children under 3 years. Be careful of scald caused by short circuit. Do not mix old and new batteries. Do not mix alkaline standard (carbon-zinc) or rechargeable batteries the kids must use under the supervision of adults. Specifications: Size:Small Brand:Xinyi Age Range (Description):Kid Item Weight:0.26 lbs Item Dimensions:3.94 x 4.72 x 1.18 inches(L x W x H) Pay Attention: 1.Suitable for 8+ years. 2.Please see the photo carefully use the correct circuit diagram to avoid short circuit. 3.Short circuit will produce high temperature and cause the battery holder case to melt and burned. 4.The kids must under the supervision of adults.