An indoor cat without a hunt in its day finds other outlets, usually your ankles at six in the morning. This ball wakes up when a paw touches it, rolls off in an unpredictable direction, works its way around obstacles and then switches itself off after about five minutes, which is roughly how long a real cat hunt lasts before the animal loses interest anyway. That automatic stop matters more than the movement: a toy that never stops becomes background noise and gets ignored. It charges by USB, so there is no battery drawer to keep stocked. Put it away between sessions rather than leaving it on the floor, because the cats that keep playing with one of these are the ones who only meet it once or twice a day.