MECC ALTE DSR is a voltage regulator for synchronous alternators, designed for standalone working and calibration; to maximize performance, the regulator should be understood as part of a system made up of at least three components: the DSR (control unit), a communications module (DI1, for example) and a supervision unit. Because the DSR is a digital version the parameters can be adjusted via a computer using and RS485 or RS232 serial interface connections when used together with the DI1 interface device. PLEASE BE ADVISED: Be careful with FAKE CHINESE CLONES advertised all over the web. They appear 100% identical even stating it’s made in Italy however the regulator is not certified by Mecc Alte. If your generator is still under warranty installing this will void it or worse it may not work at all. Key Points: Same day Worldwide Shipping Original Mecc Alte DSR AVR P.N DSR Largest AVR Stock in USA