Feature: 1. It is safe to use, the product has reverse connection protection, and the reverse connection of the instrument will not burn. 2. Easy to use, battery symbol + voltmeter, two display modes can be switched at will. 3. LCD display, blue backlight, can more intuitively observe how much power is left. 4. It is suitable for all kinds of instruments and meters, mobile portable devices, mobile power supplies, etc. 5. The installation is simple, just need simple steps to complete, use the red and black wires to connect the positive and negative poles. Specification: Item Type: Battery Indicator Material: Plastic Model: H6133 Purpose: Display Power Working Current: <5MA Sleep Power Consumption: 12uA (12V is for testing) Display Mode: LCD with backlight Backlight Color: Blue Backlight Environment Temperature: 25℃ Measuring Range: 6-100V Installation Method: Connect the red and black wires to the positive and negative poles. Package List: 1 x Power Indicator1 x Red and Black Wiring