Here is the description of the Lithium Battery Monitor LBM:

• Lithium Battery Monitor (LBM): The LBM is a monitor specifically for lithium batteries.
• Display: It has an intuitive 3.5-inch color TFT touchscreen graphic display with light sensor.
• Scope of delivery: The delivery includes M12-T cable and terminators.
• Compatibility: Suitable for up to 20 LB batteries connected in parallel and in series with 12, 24 or 48 volts.
• Dimensions: The dimensions of the monitor are 105 x 105 x 40 mm.