Lightly used Phillips Wakeup clock. HF3510. Works perfectly, I just didn’t use it much. Description: Wake up naturally Inspired by nature’s sunrise the Philips Wake-up Light uses a unique combination of light therapy and sound to wake you in a more natural way. Making it easier to get out of bed, ready for the day ahead Sunrise Simulation wakes you gradually Inspired by nature's sunrise, light gradually increases within 30 minutes until your room is filled with bright yellow light. This process of changing an increasing light stimulates your body to wake up naturally. By the time light has filled the room your chosen natural sound completes the wake up experience, leaving you ready for the day ahead.