The device may or may not work, but in any case it is not a good idea to try to use it.
As greyshade already mentioned, the print on the device states that it operates with 230 Volts at 50Hz, and the US power net does not provide that. Even a transformer would formally not help as the US power system operates on 60Hz, and a transformer will not change that.
Having said that, the device may still work at a US power net. But the print on it states that it was never intended to work there, so it may behave incorrectly and may be unsafe to use. As a battery charger is a device that is typically not observed during the entire operation time, it is likely to be not wise to try to use it in the US.
Also note that the device seems not to have FCC certification, which, depending on the way it operates, might be necessary for the US.