rilakkuma night stand clock

i bought this in a little japanese store i've never tried to make it work but it was new so im guessing it does work. apparently there's a light button, i didn't even know that lol. i don't know if it makes the whole thing light up or if it's just a little light for alarms? anyways. i tried looking it up for the size and i can't find it anywhere, but i assume it's about 4,5 inches.