Features: 1. The Product Uses High-Quality Materials And The Quality Is Guaranteed 2. Suitable For: Christmas Tree Decoration, Welding Practice, Teaching Training And Diy Enthusiasts 3. The Product Is Shipped In Parts And Needs To Be Welded By Yourself, Which Can Improve Your Hands-On Ability. 4. The Product Is And Compact In Design And Can Be Used Anytime And Anywhere. 5. The Product Uses 1 CR2032 Button Battery. Description: Kit: B-With 1x CR2032 Button Battery 1. Product Name: NE555 Flashing Light Pendant Production Kit 2. Working Voltage: DC 3V DC Power Supply 3. Pcb Board Size: Diameter . 54.8mm Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Material: PCB colour: As Shown Package Contents: 1 x Module 1 x Lanyard 1 x Pendant Chain 1 Set Fuse Resistors 1 x Battery Holder 1 x Amplifier 1 x Button Battery 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.