Charging mode IN: By setting the upper limit voltage UP and the lower limit voltage when the battery voltage less than or equal to the lower limit voltage , the relay is turned on, and the charger starts to charge the battery when the battery voltage greater or equal to the upper limit voltage UP, the relay is disconnected to complete an automatic charging the relay is turned on, IN flashes, indicating that it is charging.Discharge mode OUT: By setting the upper limit voltage UP and the lower limit voltage when the battery voltage greater or equal to the upper limit voltage UP, the relay is turned on and starts to discharge when the battery voltage less than or equal to the lower limit voltage , the relay is disconnected to complete an automatic discharge function the relay is turned on and OUT flashes, Indicates that it is discharging.Note: This product is a simple voltage controller, which uses a relay to turn on and off the output. It only functions as a switch and cannot be transformed.Function Description:1. Calculation of voltage percentage: battery voltage or (upper limit voltage-lower limit voltage)2. Button function:UP button: Short press to switch display percent and time, long press for 5 seconds to switch mode, charging mode: IN, discharging mode: OUTSET button: short press to view the currently set parameters long press the SET button to enter the parameter setting interface, set UP: voltage upper limit, : voltage lower limit, OP: conduction time, : delayed conduction time (0-999 seconds) , There is FOP in discharge mode: forced conduction time (0-10 seconds)DOWN button: Short press to turn off or on the relay enable (emergency stop function) after it is turned off, the LCD display is OFF, and the relay is disconnectedColour: blueMaterial: plasticSize: 62 x 57 x 22mmPackage Contents:1 x 30A battery charging control moduleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.