This levitator runs at a frequency of 40KHZ in the air, and can capture light objects with a density diameter of 2-3MM, such as foam balls, ants and other small objects, which are suspended stably in the air for a long time, and the mainboard is slightly heated. The circuit is mainly composed of 1 single-chip microcomputer, 1 driver chip and 2 ultrasonic transmitter heads. It is mainly used to learn about ultrasonic standing wave suspension. Working principle: Ultrasonic standing wave suspension is through the ultrasonic transmitter and the transmitter (or another transmitter) There is a certain distance (called the resonant cavity distance), the transmission wave and the reflected wave (or another sound wave) are constantly superimposed, and finally a standing wave is formed. The sound wave force on the object at the standing wave node overcomes the and finally achieves the effect of suspension. How to play: Clamp the small foam ball with tweezers, and gently place the foam ball between the two ultrasonic probes, and the foam ball will suspend. Product parameters: Power input: DC 5V (0.5-1A) Note: Different batches may have different appearance/color of electronic components, which does not affect use. Colour: Black Material: PCB+Electronic Components Package Contents: 1 * DIY Electronic Kit 1 * USB cable 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.