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.