Some Known Questions About Alarm Clocks. Of all of the possible alarm system upgrades, the dawn alarm system on the $50 Philips HF3500 is the just one that really makes it much easier to awaken in the early morning. Formed a bit like a UFO with a kickstand, the HF3500 http://sonic-bomb-alarm-clock12266.csublogs.com/2283295/the-buzz-on-alarm-clocks