Dear customer, it is only a rotary roller accessory for Laser egnravers. If you want to engrave something, you have to get a laser engraver first. Best regards.

Dear customer, this is only a rotary roller that allows you to engrave cylinder objects with a laser engraver. There is no laser set inclluded. Best regards.

Quick start guide: https://blog.geekbuying.com/2023/07/a-quick-start-guide-to-lasergrbl-parameters-settings/

Dear customer, yes it works. Best regards