Convenient Design: Battery Capacity Voltage Indicator. The battery is designed with a switch function button, allowing you to press it to check the battery capacity or real-time voltage and turn it off. Features an alarm function that activates when the battery power is below 20%, causing the display to flash. Applicable Objects: Compatible with 12V, 24V, 36V, 48V lead-acid batteries, ternary lithium batteries, polymer lithium-ion batteries, 3-15 series lithium-ion batteries, storage batteries, and other battery types. LCD Digital Display: Equipped with a waterproof PVC screen protector and bright backlight for clear visibility from various angles. Low power consumption, maximum 5mA. Wide Application: Suitable for use in gardens, homes, offices, and other environments. Durable construction ensures long-term performance to meet various needs. A practical battery indicator that enhances user experience. Functional Unit: Switch Button – Press to display battery capacity or real-time voltage and turn off. Alarm – Flashing display indicates battery charge is below 20%. Compatible With: 12V, 24V, 36V, 48V, 60V lead-acid batteries, ternary lithium batteries, polymer lithium-ion batteries, 3-15 series lithium-ion batteries, storage batteries, and similar battery types. LCD Digital Display: Waterproof PVC screen cover with bright backlight for clear reading. Note: All measurements are manually taken. Please allow 1-3 cm variation. Due to differences in lighting and screen displays, slight color variations may occur. The actual item received may vary slightly from the image.