Applying area: It can be used which the power is less than 80W, like laptop, music CD and work lamp, notebook computer etc. Protection: Overload protection, High temperature protection, Short circuit protection, Reverse polarity protection. Auto re-start function: When the inverter shuts off once it being in protection, it is not necessary to press the switch (on/off), just moving the high loads, the inverter can restart automatically. So there is no need to place the spare fuse. NOTICE: 1. Please make sure that the rated power you use in this unit is less than 80W(for long time use). In this way, the inverter can be used for a long time. 2. Unfold the fuse box, then replace the fuse with the same model. 3. Please make sure to use this unit in draught place and keep it away from high temperature, stress, tide and dust.