Amazon Basics 16-Pack Rechargeable AA NiMH Batteries, 2000 mAh, 1.2V, Low Self Discharge, Pre-Charged, Recharge up to 1000x Times

Regular 2xAA batteries works (you can see the spot in the pics) but you can also buy a pack that goes in. Personally, I use rechargeable batteries. And no worries about the Q’s