Purpose: Battery charging control protection switchSet the starting voltage: in the normal display voltage state, pressing this button will display the starting charging voltage; long press the digital tube will flash; you can set the starting charging voltage value by starting or stopping the buttonSet the stop voltage: in the normal display voltage state, press this button to display the stop charging voltage; press and hold the button for 3 seconds, the digital tube will flash; you can start or stop the button to set the stop charging voltage valueInput voltage: DC 10-30VOutput type: direct outputApplication field: 12-24V batteryMaterial:PC+metalcolour:BluePackage Contents:1 x Charge Control Module Battery Protection BoardOnly 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.