A leaflet in approximately DIN A6, on the one hand, Chinese (?), On the other, a syntactically and semantically gray blissful English, from which one is not really smart and with good English skills and after prolonged meditation. Since only patient trial and error helps through systematic hang around on the two small Einstellknöpfchen through which you navigate to an incomprehensible logic by the cryptic setup and with some time and luck can hammer out what you want.
The mentioned in the instruction date function I could not discover the best of intentions, it has my model on a sound control, which is enabled by default and I initially considered a malfunction / loose connection, because not listed in the Amazon product description. The display turns off after a few seconds and only comes back when you move the device or produced understandable sounds for the device. If you would even know and it still manages to disable this feature ...
Battery I did not try, I run the clock on a USB power adapter (not supplied) directly from the mains.
Delivery by the way lasted very long, probably came directly from the Far East.