Configuration2 or 4 AA or AAA batteriesBattery TypeNickel-Metal Hydride (NiMH) or Nickel-Cadmium (NiCd) batteries (not included)Microprocessor ControlNegative Delta-V with Zero Slope DetectionAutomatic Shut-OffSafety Guard Timer shuts off after 6.0 hr if batteries are not charging properlyInput Power100-240 VAC, 50/60 Hz, 10 WOutput PowerUp to 2.8 VDC, 500 mA per batteryCharging TimeApproximate times:
2x AAA: 100 min
4x AAA: 200 min
2x AA (1800 mAh): 110 min
4x AA (1800 mAh): 220 min
2x AA (2400-2500 mAh): 140 min
4x AA (2400-2500 mAh): 280 minIndicator Lights2x charging level indicators: Red while batteries are charging, green when charging is complete, flashing red if batteries are not charging properlyOperating Temperature32 to 113° F (0 to 45° C)Connector2-prong US plugDimensions4.3 x 2.7 x 1.3" (10.9 x 6.9 x 3.3 cm)Weight2.8