Product Details ：It Is Small Size, Light Weight,resistant And Strong With The Functions Of Low-frequency Protection And Voltage Slowly Established,emi Suppression Circuit Suitable For Generators,can Adjust The Voltage Slightly To Stabilize The Output Voltage Of The Generator When The Remanence Voltage Is Greater Than 4 V / 25 Hz,the Voltage Will Be Set Automatically Model: Avr-20a Phases:single Phase Voltage Adjustment Range:210-250 Volts Min Frequency:50/60hz Frequency Protection Adj. Range:40-50hz Output Voltage:0-115 Volts-dc At 230 Volts Output Current:20a Continuous Residual Voltage For Build Up:5 Volts Minimum Regulation:+/- Tyhristor Power Output Stage: Half Wave Tyhristor Internal Fusing:10a (fast Acting Fuse) Operating Temp:-10c (14f) To 60c (140f) Storage Temp:-20c (-4f) To 80c (176f) Maximum Humidity: Non-condensing Dimensions:125 X 68 X 35mm Fixing Centers:11 5mm, 2xm6 Material: Metal+pc Colour: Black Package Contents: 1 X Voltage Regulator Only The Above Package Content, Other Products Are