What you get: comes with 2 pieces of battery meter with alarm, ideal choices for your use and replacement needs; The range of the working voltage is from DC 12V to 84V, which can automatically detect to the accurate voltage according to the battery voltage Practical and functional: the battery capacity voltage indicators comes with switched function buttons, allowing you to easily press to check the cattery capacity or real time voltage and turn off; Featuring alarm design, the battery meter display will flash when the battery capacity is lower than 20 percent, which can give you clear reminders Wide adaptability: the battery gauge indicators are compatible with 12V/ 24V/ 36V/ 48V/ 60V/ 72V/ 84V acid battery, ternary lithium battery, polymer lithium-ion battery, 3-15 series lithium ion battery, storage battery, water battery and other different battery types, convenient for your daily needs Clear LCD digital display: the battery capacity gauge indicators are designed with PVC waterproof screen protector with bright back-light, which is convenient for you to easily read the results on the display from different angles; The low working power consumption and the max is 5 mA Multiple usages: the battery meters with alarms are widely applicable for a variety of machines and places such as garden, home, office and more, practical battery indicators will give you nice using experience; You can also share them with your friends and family
Features:

Switch button:
You can press to check the cattery capacity or real-time voltage, and turn it off conveniently.

Alarm design:
The battery meter display will flash when the battery capacity is lower than 20 percent, which can remind you in time.

Wide applications:
Fitting 12V/ 24V/ 36V/ 48V/ 60V/ 72V/ 84V acid battery, ternary lithium battery, polymer lithium-ion battery, 3-15 series lithium ion battery, storage battery, water battery and more, the battery meter can bring you lots of conveniences.

Specifications:
Working voltage: DC 12-84V
Working current: 5 mA max
Working temperature: 0-40 degrees Celsius
Display: capacity/ voltage
Back-light: as picture shows
Material: ABS
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

Package included:
2 x Battery meter with alarm