The Electric Mosquito Repeller Relec with Replacement Parts is a device designed to repel mosquitoes indoors. It works by heating the repellent liquid and releasing it into the air. This device is suitable for use in rooms up to 40 square meters. The repellent set includes a una replacement cartridge with repellent liquid.|| The repellent operates on batteries and can run for up to 48 hours with a set of batteries. It also features a timer that allows you to set the device to operate for 2, 4, or 8 hours.