Effective adjustment button: The multi-function battery indicator has a new design of the front adjustment button and has multiple functions: voltmeter cycle / battery percentage, turn on the backlight, black, sleep mode, battery type selection, etc. Practical designs: the battery capacity voltage indicators are designed with switched function button, you can press to check the battery capacity or voltage in real time and turn off, with Alarm design, battery meter display flashes when battery capacity is low LCD Display: Battery gauge indicators 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 5mA Adapt different battery: battery gauge indicators are compatible with 12V/ 24V/ 36V/ 48V/ 60V/ 72V/ 84V lead acid battery, ternary lithium battery, polymer lithium ion battery, 3-15 series lithium ion battery, storage battery, water battery and more Where to use: battery meters with alarms can be applied to different machines and places such as garden, home, office and more, can serve you for a long time, meet your different needs and practical battery indicators will give you a nice experience Note: The data are all manually measured, please allow 1-3cm error due to differences in light and display, there may be color differences, please refer to the actual item received.