This DIY Remote Control Module is a fun and engaging way to add excitement to any event. Great for lower and kids to explore early and get interested in physical experiment. Easy to use, simple to operate, and designed for beginners. 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 child's creativity and imagination are greatly developed while playing with this Electrical Experiment model. - This educational experiment emphasizes fun, exploration, and discovery, can be good gift choice to your kids. - It can bring your kids wonderful visual enjoyment, making their rest time memorable and full of fun. - After DIY and installed, you can remote control of various RC car, boat, vehicle toys. -Cultivates hands-on abilities and problem-solving skills through the process of assembling this Remote Control Module. Package list: 4 x circuit boards 4 x antennas