!!PLEASE READ IF YOU PLAN ON BUYING THIS!!
BUY RECHARGABLE AA BATTERIES FOR THIS OR YOU WILL REGRET IT. The batteries last for a few hours and then it is dead. Unless you want to be constantly spending a large chunk on batteries for this toy, buy rechargable ones.
Here is a link to the ones my brother and I use for this toy. It comes with 4 batteries and a charger pack for $18. You can buy the one with 8 batteries for $25.
EBL 8 Bay AA AAA Battery Charger with AA 2800mAh (4 Pack) and AAA 1100mAh (4 Pack) Ni-MH Rechargeable Batteries https://www.amazon.com/dp/B00FQ6K7TC/ref=cm_sw_r_cp_apa_Dd4tBbSBE57WJ
Turn it on then walk away, 5 minutes later you will hear the grind of the gears as it attacks it.
Did this with my brother's cat and she has now destroyed 4 of these things. She can't wait until we get home and turn it on again.
!!!PIECE OF ADVICE FOR ANYONE WHO BUYS THIS!!! BUY RECHARGABLE AA BATTERIES FOR THIS. The batteries will drain after a few hours and you don't want to be paying out of the ass for batteries. Amazon has a good setup for this for $18.
EBL 8 Bay AA AAA Battery Charger with AA 2800mAh (4 Pack) and AAA 1100mAh (4 Pack) Ni-MH Rechargeable Batteries https://www.amazon.com/dp/B00FQ6K7TC/ref=cm_sw_r_cp_apa_Dd4tBbSBE57WJ