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 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, recover 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.Ultra Compact design: built in 21. 7*8*3. 7inches and 9pounds, its design ideal for use on vacations, work trips, and camping, especially a good choice as requisite RV accessories. Remote control: uses the control with the light display and a set of 15 feet wired remote controller for better control The inverter on/off and monitoring actual working status (voltage indicator, audible alarm ). Fully Safety Protections: Over voltage, Low voltage, Overload, Short circuit, Over heat, polarity reverse protection(fuse), Ground protection from leakage of electricity. Intelligent cooling fan works when the temp is over 66 degree Celsius. Stable output: high quality material ensure the stable and full AC output. All big imported mosfets with strong driving capacity. Pure copper inductance, filter the wave form, ensure the true pure sine wave AC output. 2. 00mm PCB allows the stronger current floating on the circuit, increase the load capacity. WZRELB advantage: China's leading power inverter brand, provides 3500 watts continuous DC to AC power and 7000 watts instantaneous power, with LED displays for DC/AC voltages. Dual us outlets. 18-Months .