Simple and practical This is a handheld CNC control device that connects via USB. No software or driver installation is required, and the USB cable can extend to about 3 meters for flexible use. Key benefits Remote manual control: operate your machine from a distance to improve workflow and setup efficiency. Integrated 21 function keys: includes emergency stop, cycle start, spindle on/off, and more for quick access. Waterproof housing: designed to withstand dirty or oily environments and maintain reliable operation. Compatibility and design Designed specifically for Mach3 and is only suitable for Mach3. 12 x 12 mm keys ensure your fingers do not interfere with adjacent keys, reducing mispresses during operation. Dimensions and layout Size: 20.5 cm x 8 cm x 2.8 cm (8.07 in x 3.14 in x 1.1 in). Button size: 12 x 12 mm to minimize accidental presses and provide clear key targets. Use scenarios Mach3controlled CNC engraving: jog, cycle start, and spindle control from the controller for streamlined operation. Workshop setup and manual operation: use away from the PC to finetune routines or make adjustments. Dirty or oily environments: robust waterproof housing supports reliable use in challenging conditions.