The delivery is a loose part, and there is a need for a welding foundation for SMD components. If there is no foundation, be careful and weld according to the welding in the data. Generally, there is no problem. There are more than 20 kinds of display effects, and there are 12 LEDs in 3 colors. It can be all red, all green, and all blue, or you can mix and match. Can display text and patterns, using 51 single-chip control. Powered by 2 CR2032 button batteries, low power consumption. device list: Number of component names Acrylic sheet x1set M2x7 double-pass copper column x6 M2x4 screw x6 M2x6 screw x6 PCB board x1 8x22x7 bearing x1 STC8F2K08S2 microcontroller (programmed program) x1 LED green 0805 package x13 LED red 0805 package x13 LED blue 0805 package x13 200 ohm 0805 package resistor x8 4x4x1.5 button x1 104 SMD Capacitor 0805 Package x1 CR2032 positive pole piece x2 CR2032 battery x2 colour: as shown Material: ABS Size: 10x6x3cm Package Contents: 1 x LED Fidget Spindle Making Kit Only the above package content, other products are not included. Note: Light 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.