Product Review

ONLY for 12 Voltage Battery
Connect clamps with battery correctly, turn on engine, accelerate to 2000 rpm. These lights would indicate if alternator works well. If the Fault Light lit up when the alternator voltage is too high, it would hurt your battery.

Turn off Engine
These lights indicate if the battery is already fully charged.

Check Before Charge
This light indicates if the battery could be charged. When the voltage drops to 10V, the battery would be dead and can NOT be re-charged anmore.