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: Sigma Butler 2450 stem/handlebar mount is in included in the box or I have to buy it separately?
Document: Be sure to order the right one. I noticed two on Amazon. I didn't see any difference so I ordered the cheaper one. When I received it, I found out why. It didn't include the cadence sensor. I had to get the sensor from Performance Bikes. Amazon did not sell it separately. The computer works very well. I've put about 100 miles on my bike with it. It syncs up right away.
Excellent Service as Always from Trail This.Great computer for tracking the HR and distance.Sigma makes good products. Thanks
Would highly recommend this unit to someone who wants to monitor all the basics on a budget, don't forget to buy the docking station to, so y can load all your rides on your computer.
The computer is fine, but I am returning it because the heart rate transmitter is huge. It doesn't fit with my sports bra, and sticks out as a strange bump. Very odd design.
I was afraid I would hit it accidentally with my foot, but that hasn't been a problem. The heart rate strap is comfortable, but has a tendency to twist on your back when you put it on. This is the best unit for the money.
It has the right blend of stuff at the right price, not having to go to GPS and pay the extra $150 is great. I like temperature, HR, and altitude that don't come together elsewhere. It has a lot of options which become a lot to scroll through. The magnet pickup system works well.
Answer: no