Practical: The battery capacity voltage indicator features a switch function button, allowing you to press and check the battery capacity or real-time voltage, then turn off. It includes an alarm design that causes the display to flash when the battery level drops below 20 percent.Compatible with various batteries: The battery gauge supports 12V, 24V, 36V, 48V, 60V, 72V, and 84V lead acid batteries, ternary lithium batteries, polymer lithium batteries, 3-series lithium batteries, and other common battery types. Note: Not compatible with lithium iron phosphate batteries, 1-2 Li batteries in series, or more than 15 Li batteries in series.LCD digital display: Features a PVC waterproof screen protector with green backlight for clear visibility from multiple angles. The LCD display provides accurate readings of battery capacity and voltage. Low power consumption, with a maximum current draw of 5 mA.Wide application: Suitable for use in various environments including gardens, homes, offices, and industrial equipment. Durable construction ensures long-term performance and reliable monitoring.Package content: Includes 2 battery meters with alarm function, ideal for backup or replacement. Operating voltage range: DC 12V to 84V. Automatically detects and adjusts to the connected battery voltage.Specifications: Working temperature: 040C Display: Battery capacity and voltage Backlight: Green Product dimensions: 2.41 x 1.31 x 0.53 inches / 61.3 x 33.3 x 13.5 mm Mounting hole dimensions: 2.3 x 1.12 inches / 58.5 x 28.5 mm Color: Black Material: ABS Package includes: 2 x Battery meter Note: Not compatible with lithium iron phosphate batteries, 12 Li batteries in series, or over 15 Li batteries in series. The package includes only the items listed above. Note: Lighting and monitor differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 13 cm.