Features: With start / stop function, the module enters infinite cycle mode after starting, and the relay works on and off according to the set for time. Programmable battery low voltage disconnect switch for DC 12-36V lead acid battery and lithium ion battery. It's a for protection switch module, not included batteries itself. On-board momentary push button to set the low voltage disconnect parameter and 3 digit red LED display the parameter easy to operation. When the battery voltage reach the setting values, the module will disconnect load automatically to avoid the battery from over discharging to prolong the battery for lifetime. Display is accurate, the switch module is quickly to open and close when near minimum voltage; Settings is stored non-volatile, it can keep set when power off. Specifications: Material:PCB Size : Approx.5.7x4.2x1.9cm/2.24x1.65x0.74inch Power consumption: <1.5W Input Voltage Range: for DC 12-36V - Control Accuracy: 0.1V - Compatible Battery: lead acid, lithium ion battery, solar panel battery Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x for Protection Module