The worst thing you can buy.... essentially, you're throwing your money away.
The photocell is terrible, the batteries lasted only two or three days (we had to put our hand on the photocell for it to work), and the movement it makes is very mechanical and slow.

As for the construction, it's fine, and the game in front is nice, but I have 4 cats, one of which is a small 3-month-old that plays with everything. However, it never played with this toy because the photocell didn't catch it. With the larger cats I have, one was caught by it and one wasn't, and in general, it didn't work when they approached it to intrigue them. But when they left, meaning the mechanism receives a motion command from the photocell not when something enters its field of vision, but when it exits it, resulting in the cat spending an hour underneath it, looking at it and not doing anything, and when it finally gets bored and makes a movement to leave, that's when it starts working.

Useless thing.... even if you told me it costs 5€, I wouldn't buy it again.