Converting European electric outlets for American devices, voltage and hertz

I learned my lesson using this device when I plugged a alarm clock into there that difference of 50 versus 60 htz made so much difference that overnight my alarm clock Ran 2 hours slow

it caused me to miss my flight and I had to go through a rig Maro to take the flight the next day

with this I can plug in my cell phone charger I can plug in my laptop computer and I can also plug in my video camera battery charger