Features: Main chip: LM358 Suitable for 12V battery, when the battery voltage is normal, "normal" panel lights are on, the output is turned on; occurred when the battery discharge (less than about 10.4V), the board will automatically disconnect the battery output, "less pressure "indicator lights up and the buzzer is called to achieve sound and light alarm, battery discharge in order to achieve master status, to prevent excessive battery discharge and damage the battery Power consumption: Static: Since consumption is about 12 mA (battery voltage is normal); Dynamic: Self-consumption is about 100 mA (when the battery is undervoltage); Three Advantages: 1, with sound and light alarm, there is no protective effect is straight forward 2, versatility 3, the maximum allowed through 30A current board for most of the 12V battery 30A refers to the process by which the relay contact load current, the battery is not current (capacity) Board Size: 7x5cm/2.76x1.97inch Fixing Hole Diameter: 3mm Fixing Hole Distance: 6.4''/4.3cm Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Against Excessive Discharge Controller