Good idea with great shortcoming

Bought was the article to Keep the fun cats. For use, the larva has so far only on parquet. 3 cell batteries power the larva, it has a movable trunk and tail, the rhythmically moves. The front of the head, an infrared transmitter and ~ detector is mounted, by means of which obstacles are detected. Approximately 10cm in front of an obstacle takes the larva a 90 ° maneuver and then moves continued. In corners or inside a closed Cat Roller game track the larva can often run 90 ° -Mnöver before crawls on. The "tank" of the larva is quite stable and keeps cats blows from loose. So far so good.
Were it not for the drive, which can apparently terminals already powerful at the first little hooch or single hair. Two separately controllable eccentric let the larvae crawl forward, the rest is under the tank really well protected. However, there are also very delicate gears that the necessary strength can not afford the smallest foreign bodies to the rotation. Then only helps one thing: miniature Phillips screwdriver and fine, pointed tweezers. When the hull is removed - which then breaks up into more parts - you can liberate the individual gear rods of lint.
The assembly then makes really fun because you have to hold the gear rods in a skillful way, and then the multi-part fuselage set up again and screw tight.
;-)
Who then has not thrown the larva to the wall, can then again maybe the cats Keep the fun for 15 minutes.
After 30 minutes total running time, the batteries appear to be empty. So you should stock up so good.

Conclusion: From the idea, the appearance and the infrared technology ago I'm excited, but the fun does not last long and you have a lot of work and hassle with it. If the drive has been revised and the batteries stopped at least 1 hour, then I could forgive a perfect score. But yet I am disappointed.