specifications:  Output Type: Single.  Type: DC/AC Inverters.  Input Voltage: DC 12V.  USB Output: 5V 500mA.  Output Waveform: Pure Sine Wave.  Output Voltage: AC 110V/220V.  Output Frequency: 110V defaut 60HZ,220V defaut 60hz.  Output Power: 500W.  Size: 22.5x14.5x6cm.  Apply in: Car, Marine, Solar electric power/Wind electric power, Motive office, Emergency work, Outwork and so on.     Feature:  1. Inverter Converts DC12V to AC 110V/220V or USB output, Connect DC battery cables directly to your vehicles battery and you have power on the go, supply power for a variety of electric equipment.  2. Multi-Protection: built-in fuse to protect your device, safe charging design provides protection against, overheating, under and overvoltage charging, short circuiting, overloads, and overcharging.  3. Durable metal housing provides advanced protection from drops and bumps. Integrated very silent cooling fan helps reduce heat and prevents shortages.  4. The internal temperature is higher, the speed of the fan is faster, improve thermal dissipation performance greatly and protect internal circuitry.  5. The inverter could supply power for a variety of electric equipment, such as mobile phone, computer, incandescent lamp, electric fans,water dispensers, coffee cooker, induction cooker etc.     Usage methods:  1. Place the power switches of the inverter amd the AC device on the OFF position.  2. Connect properly to DC power source in compiance with the rating input voltage.  3. Plug the cord of the AC device in the output socket of the inverter.  4. Turning the switch of the inverter on(the switch indicator gives light),then that of the AC devide,this AC device can be used now as under now as under the common.     Package List:  1X 500W Inverter.  2/4X Connecting wire of inverter.  1X Fuse component bag