Features: 100% brand new and high quality. Rotate the lamp head counterclockwise to take out the rubber resistance sheet, and then tighten the head cover of the Jiang lamp to make the colorful lights light up. If you don't play with it, you will loosen the cap of the river-shaped lamp cap and insert the resistor, and the lamp cap will not always be bright. Description: Material: Plastic Color: As pictrue shown Size: As pictrue shown (1cm=2.54in Type of replacement battery: AG3(6pcs) Package includes 1 x Luminous rotating pen Notes: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you