Features: 1.This battery can show battery status, beyond that, it can also test voltage, or analyse the alternator output. 2.LCD digital display with 8pcs LED, real?time voltage display, test results are easier to read. 3.The battery clip is made of copper?plated material, with a large opening range, strong clip force, provides more accurate measurement. 4.Widely applicable to the measurement of 12V car batteries. Suitable for vehicles, RVs, yachts, etc. 5.Charging system status detection, with sound alarm function, making charging safer. 6.Adopts thick pure copper wire, durable, not aging, compact design, comfortable hand feeling. Specification: Item Type: Digital Battery Tester Material: ABS+Copper Color: Black+Red Audible Alarm: Yes Application: Suitable for measuring 12V batteries of vehicles, RVs, yachts, etc. Operation Steps: Step 1-- Connect to battery without vehicle running. Step 2-- Read battery status on left side of tester Step 3-- Start vehicle and keep it running Step 4-- Read alternator status on right side of tester