This module can detect DC current in the range of 0-10A, the accuracy is 0.01A. Functions P-1: Over-current Detection: when the detecting current lt;I1(low limit setting), the relay closes; gt;I2(high limit setting), the relay opens. P-2: Under-current Detection: when the detecting current gt;I2, the relay closes; lt;I1, the relay opens. P-3: Close in the Range: when the detecting current is between I1 and I2, the relay closes; relay opens in other situation. P-4: Open in the Range: when the detecting current is between I1 and I2, the relay opens; relay closes in other situation. P-5: Error Calibration and Delay Time Setting: the relay would not operate. Buttons K1: Modes Selection; K2: #34; #43; #34; K3: #34;- #34; Long press K1 for 2s into modes selection; short press K1 to select function and K2 to enter the mode. Note: After power on, the LED digits would pulse if the detecting current terminal is none. Specifications: Voltage: DC 12V Detecting Range: DC 0~10A Accuracy: 0.01A(10mA) Standby Current: Approx. 20mA Display: LED Digital Display Item Size: 65 * 40 * 18mm Package Weight: 29g / 1.04oz Packing List: 1 * DC Current Detection Module