I think they dont do well when exposed to direct sunlight. Finde ich etwas bevormundend, aber scheinbar will der Hersteller das so, damit der Akku nicht plötzlich leer geht. ???? The bottle cap is also unlike the picture, it is a plain black bottle cap. Being returned by UPS and Amazon have undertaken to refund the product cost (£75) and the freight cost (invoice will be forwarded (but to who?) I was so very pleased when I opened the box and saw such wonderful looking slippers. Cried a little when I put them on! My experience is the confirmation that there is an unavoidable manufacturing defect with this product. Mustache distortion of this lens is very well corrected in RAW, jpeg shooters may want to look elsewhere. It wasnt helping my bad arch issue having the little balls rub against my sensitive area non-stop.