Kodak SC1HR charger manual: http://resources.kodak.com/support/pdf/en/manuals/accessories/1HrSmartCharger/1HrSmartChgrUG_en.pdf.
Kodak SC4 charger manual: http://resources.kodak.com/support/pdf/en/manuals/accessories/4CellSmartCharger/4CellSmartChgrUG_en.pdf.
Both the Kodak SC4 and the SC1HR chargers charges in pairs only (2 or 4 cells, not 1 or 3), and cannot charge AA and AAA at the same time -- no 2 AA + 2 AAA at the same time, only 2 AA, 2 AAA, 4 AA or 4 AAA. Both can handle 110~220VAC.
The Kodak SC4 is pretty slow (310mA for AA, 120mA for AAA) so it will take 7+ hours to charge fully discharged cells.
The Kodak SC1HR charges at 2.2A (2 AA, ~1 hour), 1.1A (4 AA, ~2 hours), 0.9A (2 AAA, ~1 hour), 0.45A (4 AAA, ~2 hours). At such high charge rates, the cells will get quite warm, especially if you charge only 1 pair. If you charge a pair of batteries with significant mismatched state of charge, such as one 2100mAh AA that has 30% charge left and one that is 70% full, the fuller cell will be overcharged. The excess charge will be turned into heat (since a cell can't hold much more than 100% and the energy has to end up somewhere) and cause some cell degradation, especially at such high charge rate.
That's why I prefer chargers with individual channels per cell instead of per pair. But for those who use batteries in pairs/fours and keep the cells paired (to avoid mismatched remaining capacity), these chargers will do OK, especially at this price.