How safe are these 'Universal' DC converters?

[AVSA Andrew]

Friend of mine dug one out she bought about two years to use as a back up charger for her laptop - sent me a picture that shows blurb:

ComOn Universal DC/DC converter (72W)
For laptops
Car/Airplane use
1000mA USB outlet

Safe to use or is it likely to blow her laptop up?

 

[jatho]

 

[AVSA Andrew]

 

[chrisc]