Features Battery Tester: The battery capacity indicator module can read the approximate battery level in the current situation. HIGH ACCURACY: Comes with high precision voltage detection chip and power regulator chip, useful and reliable. LED Indicators There are 4 LEDs of different colors, and the clear display will better show the battery capacity. 4 Phase Design - The 4-phase design in red, yellow, yellow and green represents 20%, 50%, 80% and 100% power respectively. EASY TO INSTALL - 1 reserved battery detection interface and 2 positioning holes will make installation easier. Functionality: 1. Battery Tester: The battery capacity indicator module can read the approximate battery level in the current situation. 2. HIGH ACCURACY: Comes with high precision voltage detection chip and power regulator chip, useful and reliable. 3. LED indicators: There are 4 LEDs of different colors, and the clear display will show the battery capacity better. 4. 4 Phase Design - The 4-phase design in red, yellow, yellow and green represents 20%, 50%, 80% and 100% power respectively. 5. EASY TO INSTALL - 1 reserved battery detection interface and 2 positioning holes will make installation easier. Specification: Item Type: Battery Level Indicator Module Circuit board size: approx. 22.2 x 17.2 mm/0.87 x 0.68 inches. Package List: 2 x Battery Level Indicator Modules Package List 2 x Battery Level Indicator Module