High-Quality Material: The internal unit with a high-quality plastic shell, the external unit with a hard iron shell, and the premium aluminum condenser make this product sturdy and durable, so you can use it with confidence Battery Driven: This A/C is driven by 12V battery, even you are parking or your car engine is off, you can still use it. Fuel saving and longer use time Low voltage protection: Prevent excessive power consumption and start without pressure.In addition to protecting your battery, the low voltage protection mechanism allows the device to start smoothly without placing undue stress on the power source Efficient turbo compressor: 12V DC variable frequency compressor, efficient, energy-saving, low-power, and large refrigeration capacity Quantity can be directly connected to the battery to work, which is efficient, energy-saving and more energy-efficient Fit most vehicles: This type universally fit to trucks, RVs, agricultural vehicles, excavators, bulldozers, cranes, passenger cars, vans, light trucks, construction vehicles, etc.Make you have enough space to install Attention: There is no refrigerant inside the air conditioner, and R1234yf/ R134a（ 500-550g） not include， needs to be added; Vacuum for 10 minutes before adding refrigerant until the low pressure gauge shows a negative value Matters needing attention 1. There is no refrigerant inside the air conditioner, and R1234yf /R134a needs to be added （500-550g) 2. Refrigeration oil type: POE68(included) 3. Vacuum for 15-20 minutes before adding refrigerant 4. Add refrigerant pressure gauge value: low pressure 35psi, high pressure 140-180psi 5.24V electric air conditioner: minimum 80AH single battery and 60A generator are required. Meet the above conditions can be installed in a suitable space 12V electric air conditioner: minimum 100AH single battery and 70A generator are required. Meet the above conditions can be installed in a suitable space Installation steps: Install the external machine: remove the casing, mark the drilling position, use an 8mm drill to drill holes, use a riveting tool to fix the rivet nut at the drilling point, install shock pads and sleeves at the holes of the external machine, and fix the external machine to the car . Install the expansion valve: remove the iron sheet at the position of the expansion valve of the evaporator, and fix the expansion valve to the evaporator. The two black screws correspond to the two holes, so there is no need to worry about wrong installation.Then wrap it in black cotton wrap. Install the indoor unit: first install the wooden board to the indoor wall, and then install the evaporator on the wooden board. Install high and low pressure pipelines: first open a (50mm) hole in the car, and then install the rubber cover with three holes. The thick pipe is the low pressure pipe and is connected to the compressor. The thin tube is a high pressure tube and is connected to the condenser. Then connect the other end of the high and low pressure pipes to the holes corresponding to the expansion valve of the indoor unit, use long black screws and iron sheets to clamp the aluminum joints, and tighten the screws. Install the connection line: connect the connection lines of the internal and external units, plug the power cord plugs into each other, and connect the drain pipe of the evaporator. Vacuuming/Adding refrigerant: It needs to be vacuumed for 15-20 minutes, and then add refrigerant R134a/600g. The refrigerant can be added according to the pressure value. Generally, after the R134a refrigerant is injected into the air conditioning system, the pressure at the low pressure port is 35psi, and the pressure at the high pressure port is 140-180psi. Connect the power cord: Connect the power cord to the battery, pay attention to the positive and negative poles of the battery, do not connect them wrongly, + positive / - negative. It is forbidden to connect it to the power-off switch and the power switch. Turn on the air conditioner: Drive the air conditioner to see if it works properly. If the current is insufficient, the refrigerant is too much or not enough, the control panel will display a code, which can quickly troubleshoot.