Extralink buffer power supply - ensures continuity of operation. The buffer power supply is an electrical device that converts 230 V mains voltage into DC voltage. Its specificity is that we can connect an external battery to it, from which energy will be drawn in the event of a 230 V voltage failure, so as to ensure continuous operation of the receiving device. More effective cooling of the device The perforated metal casing facilitates air flow, which results in more effective cooling of the device. The screw terminals have been marked appropriately and are used to connect cable outlets in accordance with electrical rules. The installer can adjust the output voltage within a given range using a potentiometer.