Practical designs: battery capacity voltage indicators are designed with a switch function button, you can press to check cattery capacity or real-time voltage and turn off, with alarm design, the battery meter display will flash when the battery capacity is less than 20 percent Applicable objects: our battery capacity monitoring gauge indicators can be compatible with 12V 24 lead-acid batteries 36V 48V 72V, ternary lithium battery, polymer lithium-ion battery, 3-15 series lithium-ion battery, storage battery, water battery and more LCD digital display: the capacity gauge indicators of the battery come with a waterproof PVC screen protector with bright backlight, which allows you to read the results on the clear LCG screen from different angles, low working power consumption and the maximum is of 5mA Wide applications: battery meters with alarms can be applied to different machines and places such as garden, home, office and more, durable and can serve you for a long time, meeting your different needs and convenient battery indicators will give you a nice experience Features: Switch button: you can press to check cattery capacity or real-time voltage and turn it off. Alarm: battery meter display flashes when battery capacity is lower than 20%. Suitable for: 12V/ 24V/ 36V/ 48V/ 60V/ 72V/ 84V lead acid battery, ternary lithium battery, lithium battery -polymer ion, 3-15 series lithium-ion battery, storage battery, water battery and more. LCD digital display: PVC waterproof screen poterctor with bright backlight shows results clearly. Note: they cannot be applied to lithium iron phosphate batteries, 1-2 Li batteries in series and more than 15 Li batteries in series. Specifications: Working voltage: DC 12-84V Working current: 5 mA max Working temperature: 0-40 Display: Capacitance/Voltage Backlight: as picture show Material: ABS Note: Due to the light and screen setting difference, the product color may be slightly different from the picture. As manual measurement is different, please allow slight size difference. Shipping Quantity: 4 rooms