1.71.4V 3A 100-240V input. 2.The charger can easily dissipate the heat through the shell, so some hot on the shell when charging is normal, but it is durable. 3.The charger is safe to use with short circuit protection/ over current protection/ over voltage protection. 4.Intelligent charging status display: red light — charging, green light — charge finished, it stop charging automatically when the battery is fully charged. Please wait patiently after placing an order and do not repeat payment!