The electric Remote Control Module made of stable material. Easy to use, follow the detailed assembly instructions, DIY design, which will produce electricity, it can arouse students' interest to learn, and achieve good educational effect. Features - - Material:Copper - Size: 3.50X3.00X1.00cm/1.38X1.18X0.39in (transmitter) - Size: 2.40X1.90X1.00cm/0.94X0.75X0.39in (receiving board) - Transmitter voltage: DC3V - Receiving board voltage: DC3-4.5V - Mounting hole: applicable to M2.3/M2.5 screws - Remote control distance: about 3-5 meters - Wiring method: The red, black wires are connected to the power supply, and the yellow and are connected to the motor. - The material is safe and light, which is wear resistance and practical for the DIY use. - Aimed at training children with hand-eye coordination, hands-on ability, this circuit model can improve intellectual development. - It is an essential electrical consumable for secondary school physics laboratory and student home laboratory. - Functions as both an entertaining toy and an educational tool, boosting learning potential, meet diy need. - Parents can accompany their children to assembly this toy together to increase parent-child relationship. Package list: 4 x circuit boards 4 x antennas