Feature 1. Input voltage: DC 3.5 ~ 30V (do not over-voltage) 2Output voltage: DC 0.8 ~ 29V (Note: This board is a buck board requires a high input voltage is higher than the output voltage 1V or more) 3.Output current: 10A (Max.) 4.Conversion efficiency: 92% (24V to 12V/2A) 5. Protection: positive and negative input reverse protection thermal protection short circuit protection 6. Onboard voltage meter: You can display the input voltage or output voltage short press beneath button to switch LED lights labeled IN is the input voltage LED beacon of light measurement OUT is the output voltage. 7. Voltmeter can be turned off press the switch for 1~4 seconds then it can be closed