12V 24V Battery Meter with Alarm, Battery Capacity Voltage, Battery Monitors, Lead-Acid and Lithium-Ion Battery Tester (Green Lights) Easy to Use: The battery voltage tester features a switch function; press it to check battery capacity or real-time voltage. When off, the battery meter displays a flashing percentage when capacity drops below 20%. Easy to Read: Meter indicators are designed with a clear LCD digital display and include a dust cover. The waterproof PVC display with a bright backlight ensures readability from various angles, with low operating power consumption (max 5mA). For Various Batteries: Battery capacity indicator is compatible with 12V/24V lead-acid batteries, storage batteries, water batteries, etc. Please note it is not suitable for lithium iron phosphate batteries, 1-2 series lithium batteries, and more than 15 series lithium batteries. Wide Range of Applications: The battery capacity voltage indicator can be placed reliably for long-term use in various locations such as gardens, homes, offices, etc., to meet your diverse needs and make life more convenient. Product Description Features: Switch Button: You can press to display battery capacity or real-time voltage, and turn it off. Alarm: When battery capacity falls below 20%, the battery level display will flash. Suitable For: 12V/24V lead-acid battery, ternary lithium battery, polymer lithium-ion battery, 3-series lithium-ion battery up to 15, storage battery, water battery, etc. Reminder: This battery tester is not suitable for lithium iron phosphate batteries, 1-2 series lithium batteries, and more than 15 series lithium batteries. Specifications: Operating Voltage: 12-84VDC Working Current: 5mA max Working Temperature: 0-40 degrees Celsius Display: Capacity/Voltage Hardware: ABS