Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: What batteries doe's it use?
Document: I have one of each. (By the way, they use the same batteries.) Overall, I would give the edge to the Crimson Trace due to its better ergonomics and more robust mounting scheme. But you won't go wrong with either. The Crimston Trace Rail Master is highly recommended without reservation. RJB.
Installed on Ruger SR22, real easy nice and bright red laser great price with free batteries for life.What a deal
The switch has a firm enough feel that that shouldn't happen. If it does, replacement CR1-3N batteries can be got for about $1.25, and the battery can easily be removed when not needed without dismounting the laser.There are green lasers out that are brighter, at the cost of shorter battery life.
Fits my MP40 Perfectly & holds it's adjustment even after hundreds of rounds. The on / o switch is located right where your finger should rest while outside of the trigger guard & it's just an easy but firm click on & click off, no sliding switch to try to reach on the opposite side to slide off. Set up for Left or Right hand shooters out of box & free batteries for life after registering the life warrentee. Planning to buy another.
I bought this for my son for a christmas. He is very pleased with it. He can't wait to use it
This is what I needed to give me the confidence to use my pistol for self- defense. I highly recommend this product.
I have several of these Rail Master sights and I really like them a lot. Nice fit, and easy to use.
Fit my sr 22 perfectly. Easy to adjust and  Easy for my wife to use also. I recommend this product
Had to return it. Laser is too weak for use in sunlight. Size and low profile design is excellent, but the trade-off was too great in laser power and range.
Great laser easy to mount and easy to operate. you can use this laser left handed or right handed. thanks Crimson Trace.
Answer: yes