Great show! She's Radio Controlled: that is to say that the time is adjusted automatically every night and synchronized with an atomic clock. No more battery problem: a rechargeable solar energy! Put the watch in the light, and it charges like magic! A technological jewels! I have long hesitated with the M1100 eqw but my choice turned to this one because I think the dial is more readable, more precise and more Elegant bracelet, more chrnometre have a precision No 1/1000 'have no interest in every day life ...