The gyroscope uses a single chip microcomputer to control the rotation of 12 light-emitting diodes, and the flashing time of each light-emitting diode The order of flashing is controlled by the single chip microcomputer. When the electronic gyro rotates, the corresponding pattern and will appear. In order to the stability of pattern and , the circuit uses Hall IC to control the regular display of pattern, that is, for each rotation, Hall IC senses the magnet, then feeds back the model number to the single chip microcomputer, and uses button battery for power supply When the battery gyro is turned off, the MCU automatically enters low power consumption. When you press the switch, you can turn on the LED. It can rotate with the gyro rotating on the finger, display words and patterns, use 3 cr1220 button batteries in series to supply power, and supply it to the single chip microcomputer after stabilizing the voltage to 5V through the voltage stabilizing chip. With a power switch, the single chip microcomputer controls 24 to flash at high speed according to the font data, and make use of the visual persistence of human eyes or pattern is presented in the rotation range of 24 . The which are suitable for electronic enthusiasts to study and repair circuits. The installation of the circuit requires the buyer to have experience in the circuit. Battery not include in the package ! For the soldering of the , it is recommended to use 0.6-0.8mm solder, 63% tin low melting solder wire, 20W-30W pointed or knife edge. Size: 74 x 26 x 10mm type: Electronic DIY Kit color:Black+transparent Material:plastic+metal Package Contents: 1 set x Electronic DIY Kit(without 3 CR1620 button batteries) Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.