Fully Charges 1 to 4 pcs AA/AAA cell in 30 minutesPowered by a switching power AC adaptor with worldwide input from 100-240VAC 50/60Hz4 independent channels with individual LED display for quick charge/trickle charge/bad cell detectionAutomatic charging currect selection for AA & AAA batteriesIntelligent microprocessor controlledNegative delta V cut-off functionTemperature sensors to avoid the battery from being damage by over-heatingSafety timer controlledWith 12V car charging functionPacking Each in a clamshell packDownload product manual here.