brand new and high quality. Features: Works on general lead acid storage battery and has a powerful battery level testing system. Automatic recognize 12/24/36/48/60/72V , practical for use. Recognize false battery charging signal. Battery Indicator only, other accessories demo in the picture is not included! Built-in wiring method: 1. Insert the matched 15cm wire into the reserved terminal position on the back of the product, pay attention to the direction of the plug; 2. The red wire is connected to the positive electrode of the battery, and the black is connected to the negative electrode. Please make sure the wires are in good contact; 3. After being connected, the product will display the number of batteries, percentage power and voltage cycle display. Definition of shortcut keys: 1. Short press the U/D button to turn off the backlight, then press the U/D button to turn it off completely and cycle through; 2. Short press the SET button to display the voltage, then press the SET button shortly to display the percentage and cycle through the display. Specification: Item Name: Battery Indicator Material: Plastic Display: LED Display Housing Material: ABS Voltage Range: 9-90V Operating Temperature: -10C~65C Operating Humidity: 10-80%RH Product Size: 46x25mm / 2.52x0.98in Package Size: 6.5x5x5.7cm / 2.56x1.97x2.24in Color: Black Quantity: 1 Pc Note: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Pc x Battery Capacity Tester 1 Pc x Power Cable 2 Pcs x Screw