Yes it's just a button LOL.
RRP:$49.95, was $39.95 yesterday but cheaper again today for whatever reason. Current price not even registering on Camels, which last updated 26 days ago (I dunno how to trigger it to update).
FWIW the item description has pictures in Japanese and text for the Indoor Motion Sensor so caveat emptor I guess, even though the seller is Amazon AU. I'm not aware of any Hue knock-offs…
Do people really like buying new coin battery every year? I prefer the new IKEA's AAA one.