omegel6 years ago+220What are the differences between all the Philips models (apart from shape and colour): "Wake Up Light", "HF3506/05", "HF3510/10", "HF3520", "HF3531/01"?Show in original language (French)marsali.auberson6 years ago • purchased this product-101purchased this productThe price & the sounds (except radio)... After that, the purpose of the thing is to wake up naturally by light, especially in winterShow in original language (French)Comment