This is a small ultrasonic suspension device that can suspend foam balls; This suspension device runs at a frequency of 40KHZ in the air, which can capture light objects with a density diameter of 2-3MM, such as foam balls, ants and other tiny items in the air for a long time stable levitation, the main board slightly heats; The circuit is mainly composed of 1 single-chip microcomputer, 1 driver chip and 2 ultrasonic emitting heads; It is mainly used to learn to understand ultrasonic standing wave levitation. It is suitable for students or DIY electronics enthusiasts to learn ultrasonic levitation standing waves. Power input:DC 12V (0.5-1A) Frequency:40KHZ Working temperature:-25C-85C Working principle: ultrasonic standing wave levitation is through the ultrasonic transmitter and the transmitter (or another transmitter) there is a certain distance (called resonator distance), the emission wave and the reflected wave (or another sound wave) are continuously superimposed, and finally the standing wave is formed, and the sound wave force of the object at the standing wave node overcomes the gravity effect, and finally achieves the effect of levitation. Colour:Black Material:Electronic component Size:Appearance dimensions (finished product):44x40x66mm Package Contents: 1 set * DIY parts (requires assembly) 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.