EXT Module When the EXT Module is installed, it lets the ELT-2 be externally powered and be used as a class C or a class A device. Add this to the ELT-2 to control external sensors such as lightning or actuators/relays. It can also be set to output 0-10V voltage. https://elecena.pl/product/24385913/elt-mod-ext-ext-module-for-elt-2 2023-10-22 https://elecena.pl/product/24385913/elt-mod-ext-ext-module-for-elt-2 2025-11-18