It is small size, light weight,resistant and strongWith the functions of Low-frequency protection and voltage slowly established,EMI suppression circuitSuitable for generators,can adjust the voltage slightly to stabilize the output voltage of the generatorWhen the voltage is 4 v / 25 hz,the Voltage will be set automaticallyModel: AVR-20APhases:single phaseVoltage Adjustment Range:210-250 volts minFrequency:50/60HZFrequency Protection Adj. Range:40-50HZOutput Voltage:0-115 volts-DC at 230 voltsOutput Current:20A continuousResidual Voltage For Up:5 volts minimumRegulation:+/-2% tyhristorPower Output Stage: half wave tyhristorInternal Fusing:10A (fast acting fuse)Operating temp:-10C (14F) TO 60C (140F)Storage temp:-20C (-4F) TO 80C (176F)Maximum humidity:95% non-condensingDimensions:125 x 68 x 35mmFixing centers:11 5mm, 2xM6Material: Metal+PCcolour: blackPackage Contents:1 x Voltage RegulatorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.