Feature: 1. This product is a device that transfer DC voltage to AC voltage. 2. It's designed based on international advanced circuit: smart size, easy operation, stable performance, high efficiency are main advantages. 3. Apply for digital products, office appliances, small household appliances, portable electric power tools, etc. 4. Low voltage protection. 5. Over voltage protection. 6. Overload protection. 7. Over heat protection. 8, Short circuit protection. OPERATION INSTRUCTION: Wrong connection may damage inverter and appliance, please connect in rights way according to following process: 1. When use inside car or loading less than 200W: Connect cigar lighter plug's red cable to "+" terminal of inverter and black cable to"-" terminal of inverter, screw th terminal lightly. Insert the lighter plug into cigar lighter socket and turn on the switch, when green light of inverter is on, connect the plug of appliance to AC socket of inverter. 2. When use outside car or loading exceed 200W: First connect the red battery cable to "+" terminal of inverter and black battery cable to "-" terminal of inverter then connect the clip of red cable to "+" terminal of battery and clip of black cable to "-" terminal of battery. Turn on the switch, when green light of inverter is on, connect the plug of appliance to AC socket of inverter. If you don't use, please separate the cable from battery. TECHNOLOGY DATA: Max power: 300W Input voltage: DC12V Output voltage: AC220V/50Hz Size: 158*100*43mm/6.22*3.94*1.69in Package includes: 1x Car inverter