Wide operating voltage range: The battery monitor is designed to withstand a wide operating voltage range (DC 6 - 63 V). It supports 12 V, 24 V, 36 V, and 48 V systems and automatically adjusts based on battery voltage. The test circuit does not require an external power supply. Waterproof PVC case with a 15.24 cm display and two control buttons. Buttons allow selection of capacity, voltage, or power off functions. The "Settings" button enables configuration of battery specifications. Clear and bright LCD display: The battery monitor provides a sharp, high-quality LCD readout visible from all angles. Automatically enters sleep mode after 10 seconds to conserve power. Reverse polarity protection: Includes reverse polarity protection to prevent damage if connected incorrectly. Compatible battery types: Suitable for lithium-ion batteries, ternary lithium batteries, polymer lithium batteries, and lead-acid batteries. Not compatible with lithium iron phosphate (LiFePO4) batteries in series configurations of 12 or more than 15 cells. Material: ABS plastic Color: Black Package Contents: 1 x Digital LCD Battery Capacity Tester 1 x Cable Note: Only the items listed are included. Lighting and display differences may cause slight color variations between the image and actual product. Measurement error allowance is +/- 1-3 cm.