The Vivitar 1 Hour LCD Charger is specially designed with an electric blue LCD display screen. It recharges 2 or 4 AA or AAA NiMH batteries at a time. This charger is powered by the supplied switching mode 100-240V AC Adaptor for indoor use, or by the DC car adaptor for use in a vehicle. Your battery's life is well protected, with a negative delta V cut-off function, timer protection, and temperature sensors to prevent the batteries from being damaged by overheat.