XH-M609 Deep Discharge Protection Switch Cut Off Digital LED Display Over-discharge Protect for 12-36V Lithium BatteryFunction:Programmable battery deep discharge protection switch for DC 12-36V lead acid battery and lithium ion battery. It is a protection switch module, not included batteries itself. Features:On-board momentary push button to control the deep discharge protection parameter and 3 digit red LED display the parameter easilyWhen the battery voltage reach the setting values, the module will dis load automatically to discharge the battery to extend the battery lifeDisplay is accurate, the switch module is quick to open and close when near minimum voltage; Settings is stored non-volatile, it can keep set when power off. Specification:Input voltage: DC 12-36VControl Accuracy: 0.1VCompatible Battery: lead acid, lithium ion battery, solar panel batteryInstructions:1. Double click the + number button, then press + or button, the stop voltage value2. Double click the number button, then press + or button, set the return voltage value3. Press the + number button, then press the + or button, to calibrate the input voltage display value4. Press the number button, then press + or button, set the latency start value T. At the time of the output voltage reaches the start value, after the delay T, there is an output voltage, the delay time is 0 - 10 minutes, the display category is: 000 or 001 or 0105. Click the + number button to set the stop voltage value6. Click the number button to return the voltage value7. The difference in the difference can be set to 48V, minimum can be set to 0.5VPackage IncludedDC voltage protection module*1