<p>Calculation of voltage percentage: battery voltage \/ (upper limit voltage - lower limit voltage)</p> <p>Key function: Up button: short press to switch display% and time, long press for 5 seconds to switch mode, charging mode: in, discharging mode: out</p> <p>Set button: short press to view the currently set parameters; long press set button to enter the parameter setting interface, setting up: upper voltage limit, : lower voltage limit, Op: conduction time, : delayed conduction time (0-999 seconds), FOP: forced conduction time (0-10 seconds) in discharge mode</p> <p>Down button: short press the close \/ open relay enable (emergency stop function) to close, the LCD displays off, and the relay is disconnected. Long press the down button to set the LCD backlight status. L-P: off backlight is always on, on: backlight automatically goes out after 5-10 minutes; after it goes out, press any button to wake up.</p> <p>Parameter setting: 1. Press and hold the set key to enter the parameter setting interface; 2. After entering the parameter setting interface, short press the set key to switch the set parameters; 3. After the parameters are , they can be set by up \/ down key. Short press and long press are supported; 4. If you want to set other parameters, repeat steps b) and C); 5. After all parameters are set, long press set key to exit and save</p> <p>Color: black</p> <p>Material: ABS</p> <p>Package Contents:</p> <p>1 x Battery protector</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection 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.</p>