Note: 1. The board is high frequency square wave dc output so it can not drive general inductive electric appliances, such as electromotor, electric fan, coil transformer, etc. 2. When connected with small load(LED light, phone charger, etc.), please connect to the gear of low output voltage 3. When work for a long time under large load, suggest to strengthen the cooling fan. 4. Don’t connect the power reversely, and the power supply and power cable should be with enough large current. 5. Don’t overload or short circuit the output. 6. High frequency output low voltage measured by multimeter will display higher(it’s not correct, not the actual voltage).