Check the listing for details. Ender 3 Auto Off Switch Creality 3D Printer. Condition: New. Listed at 19.99 USD. Ender 3 Auto Off switch, Plug & Play Shuts off the printer after it finishes a print, to keep your printer from wasting power running idle. Mounts just below the bed and switches off the printer once the machine finishes and slides the build plate forward. (The head of the bolt must be facing downward in order to properly trigger the switch, some printers the bolt is in the correct orientation others you just need to remove the bed and flip the bolt over) Plug the wires in between the fuse and power switch, no cutting or splicing wires. And You still retain use of the original power switch. To turn back on just push your build plate back. You could also mount it to other spots and add your custom G code to trigger the switch. Specifically designed for the Ender 3 and mounts via 2 T-nuts. Will work with other printers but may require some modifications The last pictures show instructions for installation. Includes 1 switch with all necessary mounting hardware and wires. Can be seen in the last picture. Does Not include power supply or printer