Feature: 1. With the function of checking the battery, power function test, checking the starting capacity of the battery and battery overcharge displaying. 2. 6 LED lights show the status of the battery and alternator, green means good/full, orange means medium, and red means low. Intuitive and simple. 3. The reverse protection function can prevent burnout due to misoperation between (+) battery terminals and (‑) cable terminals. 4. Pure copper wire and wire clip have excellent conductivity and high sensitivity, and the non‑slip designed allows you to use it flexibly even when wearing gloves. 5. Suitable for all 12V charging systems, including car, forklifts, SUVs, pickups, boats, RVs, motorcycles, etc. Specification: Condition: Brand New Item Type: Automotive Battery Tester Material: ABS Color: As picture shown Cable Material: 0.06mm Square Copper Maximum Voltage and Current: 12V 15A Application: Suitable for all 12V charging systems, including car, forklifts, hybrid vehicles, SUVs, pickups, boats, motorhomes, motorcycles. Main Function: 1. Check the battery 2. Power function test 3. Check the starting capacity of the battery 4. Battery overcharge display Wiring Method: Connect the red wire clip to the positive pole (+) of the battery and the black wire clip to the negative pole (-) of the battery. 6 LED Lights: Alternator State Check: First Light (Red): Fault Second Light (Green): Good Third Light (Green): Full Battery State Check: First Light (Yellow): Middle Second Light (Red): Low Third Light (Green): OK Different LED display to show Battery Sate: Display 1: All LED lights off; testing results: none charging voltage, dead battery Display 2: "ON" led twinkling, other led off; testing results:4.6-11.2v charging voltage, engine being hardly turned on, turn off all electrical equipment and charge battery immediately. Display 3: "ON" led on,"low” led twinkling; testing results:11.2-11.6v charging voltage, low charged battery, being charged immediately. Display 4: "Low" led on, "middle" led twinkling; testing results: 11.6-12.2v charging voltage, middle charged battery, better being charged sooner. Display 5: “Middle" Led on; Testing results: 12.2V Charging Voltage, Middle charged Battery, better being charged. Display 6: “Middle" Led on, "Full" Led twinkling; Testing results: 12.2-13.1V Charging Voltage, Middle charged Battery, better being charged. Display 7: “Full" Led on, "Good" Led twinkling; Testing results: 13.1-14V Charging Voltage, Good battery, Full Charged Display 8: "Good" Led on; Testing results: 14V Charging Voltage, Good battery, Full Charged. Display 9: "Good" Led on, “Fault" Led twinkling; Testing results: 14-16V Charging Voltage, Battery may be damaged, Check the engine and tester. Display 10: “Fault" Led on; Testing results: Above 16V Charging Voltage, fault Battery.. Package List: 1 x Battery Tester1 x Manual