“Delivers up to 10W: Engineered to safely deliver up to 7. 5W of power”
So, you can get up to 7.5W safely, but if you’re feeling lucky you can shoot for 10W? 
“Delivers up to 10W: Engineered to safely deliver up to 7. 5W of power”
So, you can get up to 7.5W safely, but if you’re feeling lucky you can shoot for 10W?