1. Over-voltage protection. Under-voltage protection. Over-current protection2. Automatic recovery. Voltage display(voltage measurement). Current display (current measurement)3. Voltage calibration: Voltage +-10% adjustable. A134. Restore factory settings: press the button for more than 12s5. Fault inquiry: Press the UP button from more than 12SProduct Parameters:1. number:TOWJR-22. supply:230VAC 50/60Hz3.Over-voltage protection value range:240V~300V~OFFOver-voltage recovery voltage range:245V--305VOver-voltage protection action time:0.1s~30s(default value:0.5s)Over-voltage recovery delay time:1s~400s(default:30s)4.Under-voltage protection value range:120V--200V --OFFUnder-voltage recovery voltage range:125V--205VUnder-voltage protection action time:0.1s~30s(default:0.5s)Under-voltage recovery delay time:1s~400s(default:30s)5.Over-current adjustment range:1-40AOver-current action range:0.1~30 second (default:0.5s)Over-currentrecovery delay time:1s~400s(default:30s)6. -on delay time:1s~400s(default:10s)7. consumption : Less than 2W8. Electric machinery life : 100,000 9. Installation:35mm DIN railType: Voltage protectorcolor:As shownMaterial:plasticPackage Contents:1 x adjustable voltage protector(40A)Only the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.