The Philips HF3500 Wake-Up Light Alarm Clock is designed to wake you up more naturally by using a "sunrise simulation" that gradually increases in brightness over a 30-minute period before your set alarm time. It mimics a natural sunrise to help you feel more refreshed upon waking and features ten different light intensity settings, allowing it to function as a reading or bedside lamp. Simply tap the light to snooze your alarm. The device is UV-free. The manual for the HF3500 model can be found online. There are also helpful guides on YouTube for changing time settings and adjusting the alarm ringtone. Pre-owned.