HiStrips: Boost Performance & Live Healthier for Top Athletes ad: Built For Heavy Sleepers. By Heavy Sleepers.

You've slept through phone alarms. Through multiple alarms. Through alarms across the room. Onyx was built for you. Instead of sound your brain ignores, it uses powerful vibrations directly on your wrist. The intensity gradually increases until you wake—even from deep sleep. Tested by 10,000+ heavy sleepers. 99% wake up on time. 14+ day battery life. Lightweight design you'll forget you're wearing. 100-day Wake-Up Guarantee: If it doesn't wake you, you don't pay.