Supply Voltage: DC 12-36V ,Output Voltage: Equal to supply voltage ,Control Precision: 0.1V Power: Less than 1.5W Main functions: over charge protection, over discharge protection function, short circuit protection function, over current protection function. Widely use:This product is suitable for a of batteries and lithium batteries, a wide range of applications. When the battery is under voltage loss or low battery, it will be automatically disconnected. When the battery voltage reach the setting values, the module will disconnect load automatically to aviod the battery from over discharging to prolong the battery lifetime Compatible Battery: lead acid, lithium ion battery, solar panel battery Operation Instructions: Press "+" the LED displays the low voltage protection parameter. Hold on the "+" to enter setting manual to set the protection parameter Press "-" will display the difference value. Hold on the "-" to enter setting manual to set the difference value. What is the "difference value"? The value between the battery voltage to disconnect and the battery voltage to reconnect. Example I want the battery to stop outputting when the battery voltage is lower than 11V and re-output when it is over 11.6V. What should I do? Hold on "+" and set the value as 11. The LED starts flashing. After the flashing stops, hold on "-" and set the difference value as 0.6V. Stop 11V,voltage higher than 11.6V start? Long press + screen slave flashing is set to 11,then long press - screen flashing set to 0.6 is OK. Is it lower than 12.5V and the voltage is higher than 14.8V? Long press + screen flashing to set the stop value to 12.5,wait for the screen to not flash,press and hold - the screen flashes,set the hysteresis voltage to 2.3V. color: blue material: plastic kage Contents: 5 x Low Voltage Disconnect Switch Module Only 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.