What’s the best travel alarm clock to buy if you’re bad at waking up?

I’m trying to find the best travel alarm clock that’s loud ( super loud!!! ) and will wake someone up if they’re a deep sleeper and have a reputation of NOT getting up. The alarm will need it to work overseas (Kenya) while away for work. Any suggestions would help a lot!

Seiko Get Up and Glow Travel Alarm Clock #QHL004KLH

Black Metallic Case – Digital Dial

Amazon.com Product DescriptionDon’t leave home without the Seiko Travel Alarm Get Up and Glow Clock. An ideal timekeeper for frequent travelers, this perfectly portable alarm clock packs up easily, with a stand that folds into the carrying case, so you can conveniently keep your schedule — and timekeeping system — [...]

ELGIN TRAVEL ALARM CLOCK

Elgin’s travel alarm clock is handy and easily transportable, measuring 5 by 5 by 4 inches, and weighing 6.1 ounces
It has a 7/10-inch LCD with an indiglo feature that makes it easy to tell time in the dark
Runs by highly accurate quartz movement and requires one AAA battery
Protective cover keeps the clock safe from the [...]