Features: It can replace the laser used in the Atomstack 20W series (X20 or S20 or A20 Pro) and the laser window mirror of the M100 and M150 modules, and is used to solve the problems of broken and stained glass of the window mirror. Applicable models: Atomstack A30 Pro, X30 Pro, S30 Pro, X20 Pro, A20 Pro, S20 Pro, M100 laser module, also used for M150 laser module. Replacement method: Rotate and remove the original window mirror, wipe the inside of the laser and the new window mirror with a dust-free cloth, and rotate and fix the new window mirror. Notes: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Please allow 1-3mm measuring deviation due to manual measurement. Thank you for your understanding! Packing list: 3x20W Window lens Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.