Instructions for use: 1. Can be used to convert 8V~12V DC battery to household 220V AC power; High frequency power is available: 220V 0.1W~20W; 2. Can be used on any circuit board appliances; such as energy-saving lamp; High performance stable power and good effect; 3. Built-in circuit protection system when you connect to wrong line or connect reversed it will automatically disconnect power supply effectively preventing board from damage 4. Can make booster circuit yourself one circuit board maximum power of 20W; If you think power is too small you can put the board in parallel 10 boards in parallel power up to 120W~200W can be used for other high power household appliances! 5. Can be used for any appliances when power is cut off; Parallel circuit if power of household appliances is large will not burn appliances due to large current; Power saving up to 48.26%.