BATTERY CAPACITY VOLTAGE METER - The battery gauge displays a bar and the voltage level of the battery in use, helping you determine when recharging is needed. It will flash to alert when the battery capacity drops below 20%. SUITABLE FOR VARIOUS BATTERY TYPES - Compatible with ternary lithium batteries, polymer lithium-ion batteries, 3-cell lithium-ion batteries, storage batteries, and lead-acid batteries. (Note: Not compatible with lithium iron phosphate batteries, 1-2 cell lithium batteries in series, or more than 15 lithium cells in series.) SLEEPING MODE & BLUE BACKLIGHT - The battery monitor can be set to automatically turn off after 10 seconds or remain continuously on, displaying either percentage or voltage (Vdc). The blue LCD display is easy to read. Built-in reverse polarity protection. WIDELY USED - These compact battery capacity voltage meters feature a rear cover and simple wiring: connect the red wire to positive and the black wire to negative. Ideal for use in golf carts, boats, cars, RVs, and motorcycles. DETAILED INSTRUCTION INCLUDED - Package includes 1 battery meter and 1 2-pin wire. Follow the included instructions for easy setup and installation. Specifications: - Voltage Display Range: 9-100V - Working Current: less than 5mA - Sleeping Mode Current: 12uA (tested at 12V) - Operating Temperature: -10C to 50C - Compatible Batteries: Lead-Acid Batteries (DC 12/24/36/48/60/72/84V); Lithium Batteries (3 to 24 cells in series); Lithium Iron Phosphate Batteries (4 to 26 cells in series) - Color: Black - Material: ABS Package Contents: 1 x Battery Capacity Voltmeter (with blue backlight) 1 x 2-Pin Wire (red and black) Notes: 1. The setting button is located on the back of the meter; configuration must be completed before installation. 2. Operating environment should be between -10C and 50C; temperatures above 50C may reduce LCD lifespan. Package includes only the items listed above; other accessories are not included. Note: Lighting and monitor differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.