• The HeaterCore secures onto a Revo-compatible cold side using a Revo HeaterCore spring (included). After its attached, just screw in a Revo Nozzle and youre ready for simple, tool-free nozzle swaps that dont need hot tightening.
• Heats up much faster than a typical heaterblock. Its designed to be much safer, too a positive temperature coefficient (PTC) means power reduces as it gets hotter, reducing hazards in the event of a thermal runaway.
• Compatible with many popular 3D printers such as Creality CR series and Ender series, Prusa, Anet, Biqu, Monoprice, and many more.
• Learn everything you need to know about the Revo HeaterCore in E3D’sblog.

Unsure on the voltage you need? E3D has a nice page to help you identify the voltage from your power supply:https://e3d-online.com/blogs/news/12v-vs-24v