I buy this sun alarm 3 year ago and it have make a huge difference in how I feel after wake up in the morning . alarm clock use to make I feel edgy and tense but wake up to a slow simulated dawn be really peaceful . I have the backup radio alarm set to go off if the light do not wake I but so far I have only need that maybe a handful of time in 3 year . you do have to make sure the alarm be eye-level next to the bed for it to work really well though . the only gripe I really have be that there be a way to dim the display light but it be somewhat complicated and everytime the power go off -lrb- which be a lot in Florida -rrb- , I have to look it up again . but other than that , this be a decent product that accomplish the goal of wake up peacefully . :0 -rrb-