The Philips HF3520 is designed to help you wind down to sleep and to wake up naturally, feeling refreshed. Like the rising sun, the red to yellow dawn simulation helps you to wake up naturally. It has 5 wake up sounds, FM radio and a tap snooze to go with the coloured Sunrise wake up. 20 brightness settings allow you to use the product as a bedside reading lamp. The HF3520's dusk simulation drifts you to sleep by dimming the light and sound. Clinically proven to improve your wellbeing. Automatic universal voltage (100-240V). 2 year manufacturer's warranty.