Did you notice the seller location? Kowloon. That's a nexus of crime for Asia. It's the "Mos Eisley Space Port" of China. You'd be better off burning that money because it will at least give you warmth.
Not to mention that this watch, if it even existed, is likely non functional, and made from recycled cadmium and cast lead. So it will turn your skin green... and then black. Then your hand will fall off and the stump will develope cancer.
And I'm quite certain the (scam) artist who developed this watch has never once washed his hands after using the toilet. And he eats nothing but spicy fish stew and McDonalds. Highly unlikely the device would make it through customs due to the biohazardous fecality contained within.