I tried sticking it to the window and the suction cup absolutely DOES NOT stick. I'll use it another way, but if I wanted a toy to play with my cat myself, I would've just bought a wand. I STRONGLY DO NOT RECOMMEND.
The elastic snapped after just 2 minutes of play, not worth the money even though it's cheap, the cat just got frustrated with a useless bit of elastic.
Unfortunately, the product doesn't live up to its advertising promise. The suction cup keeps falling off, so maybe you could still attach the toy animal to a string. My cat was bored. What a shame!