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About WZRELB professional manufacturer for pure sine WAVE power inverter for 10 years provide prompt reply friendly customer service and 18-month Product details DC input 24V DC input range 21v-30v efficiency 85%-90% AC output 120V adjustable> frequency 60Hz socket dual us Type> low voltage alarm 19 5V-21 5V low voltage shut down 18 5V-20 5V over load shut off recovery manually> over voltage shut down 30 5V cooling ways cooling fan will run when the temp is over 50 degree celsius precautions 1 Please do not connect the inverter with the grid power and a reverse connection of positive and negative is also forbidden 2 Please do not overload If your applications are inductive loads please choose the inverters whose continuous power is 3-7 times higher than the watts of your appliances If you want to power up a refrigerator we suggest you use 10 times higher power inverter 3 Please turn off the load first then turn off the inverter And as there is a soft start function please turn on the inverter first then turn on your loads or the output may not stable at the first seconds 4 For a red light flashing it remind that the input voltage is a bit high 5 Please use the set of standard Battery cables we sent or a full output may not be There are Build-in fuse for safety concern The fuse come with package are just spare parts 6 Considering transportation safety We took off the battery of remote controller you can buy it in your local place Its specification is 23a 12V