Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: How many and what kind of batteries does the mouse take?
Document: The product comes with no batteries. You have to go get them yourself. What's more: the mouse uses AA battery but the keyboard uses AAA... what kind of design is that?Their customer service is really good though: works hard and tries everything to make sure you are happy.
It also seemed to have a hard time turning on, I would press the DPI button any no red flashing would show up on the mouse I would take out the batteries and still no response I even found my self banging it on my table a couple of times until finally it would turn on.Again sorry if this review was misguiding this was just my experience
It works great! Two AAA batteries for the keyboard and 1 AA battery for the mouse. Compact, exactly what I wanted. Keyboard and mouse has slot for USB receiver to be stored while not in use. Connection is perfect.5 stars if it had on/off switch.There is no on/off switch on either of the keyboard or mouse. To keep battery life, I flip one battery in the keyboard around and completely take out the battery in the mouse.
I have my spare laptop hooked up to my TV through HDMI and use the mouse and keyboard to access it. It's small enough not to take up much room on the coffee table but big enough to be able to type on it alright. The battery life is pretty good to me! I had it for a few months now, use it every day and haven't changed the batteries yet. Then again I am not a heavy user since I only use them to bring up Youtube and other media.
It connects via USB, so if you're looking for something that works with a tablet, be sure to check your tablet's documentation to make sure it can take a USB keyboard.Unless you're using a very old computer, this set is plug & play. Just plug the USB transceiver into an available port, put in the batteries, and - whoops, hold on there a sec, batteries are not included! (Seriously, Anker?
Needed a small keyboard and mouse that would not take up much space on a child's desk. Using it on an old XP system. Works great.
They don't take up too much room in his backpack and the USB fits nicely in the mouse OR in the keyboard for storage. He has not encountered any issues with them at all.He gives it 5 stars and recommends these products.
keyboard works nice sometimes you have to take the battery out to reset it but the mouse is horrible  jitters alot went out and bought a microsoft mouse 14.00 works great
I feel bad writing this because it might of just been my experience. When I first got it it was working fine one thing I do need to say is that the mouse is very small (my fault for not reading in depth). I wouldn't recommend it at all for gaming or any other type of fast paced mouse movement. I'm mostly pissed because it managed to take one of my usb slots with it.
I do appreciate that the keys are spaced exactly the same as the Apple keyboard so it doesn't take any getting used to when using it.The price difference between this and the Apple keyboard is big so you might be willing to overlook those small differences to save a lot of money. The mouse is really nice considering it is a part of such an affordable combo. I wouldn't be surprised to see this mouse for sale on its own for at least $20. Overall, this combo is a winner.
Answer: Mouse takes 1 AA