The SAD Light Therapy unit is surprisingly compact. No complicated set up required: just take it out of the box and plug it in. The unit sits happily on your desk and takes up very little space. But does it work? Will it bring a ray of summer sunshine to a miserable winter morning? Here at Spring Chicken the answer is an overwhelming "Yes!". Our testers reported improved mood, more energy and improved concentration. Both portable and effective: the SAD Therapy Unit really does work.