Nlkvilla For SKIL 12V 3A Battery With LED indicator light QC535701 The LED indicators work as follows:Green light flashing means charging, green light always on means full power, red light flashing means high temperature protection, red light always on means battery abnormality With short-circuit protection, over-charging protection, overload protection, etc. to make your charging process more safe Packed in a PE bag with instructions Packed in a brown cardboard box You don't need to worry if you have any questions. We provide 30-day refund and 24-hour online service,please contact us and we will solve it for you ASAP if you have any problem For SKIL 12V Fast Lithium Ion Battery Charger LED indicator light Can be used For 12V Battery QC535701