I won't describe the product in detail, discuss instructions, etc. as that has been covered extensively by other reviewers.

PROS: (1) Low price. (2) Has the all basic functions needed by a beginner to intermediate biker to track their progress / measure their improvement.  (3) Reliable and consistent (at first) as long as the cyclometer is properly set up for you bike and is firmly seated into the mount.

CONS: (1) Poor build quality and plastics, especially the mount, which means this cyclometer's measurements will become unreliable in the long run. (2) The mount is only suitable for the handlebar; if you want to attach the cyclometer to the stem, you have to look elsewhere (or make modifications to the mount).

DETAIL: I've purchased 4 of these and/or their Bell twins, both wired and wireless models, and installed them on 4 bikes. After going thru cold winter riding season followed by hot summer rides (e.g, about a year), ALL of them started getting loose in the mount, causing unreliable readings as the cyclometer would lose then regain contact to the mount as the bicycle hit bumps in the road. Identical rides would be measured at 26.7 miles one day, 18.4 miles the next and 21.8 miles the third.  Average speeds would vary by 3-4 mph from day to day, when my watch showed that I was covering a fixed course at in the same amount of time. VERY frustrating.

QUICK FIX: If you choose to buy this cyclometer and eventually start to experience reliability problems, try using a thin rubber band to hold the cyclometer firmly to the mount. After I did that the readings became reliable / consistent again and the cyclometer has yet to fall out of the mount, no matter how hard a bump I've hit.

Safe biking!
I won't describe the product in detail, discuss instructions, etc. as that has been covered extensively by other reviewers. PROS: (1) Low price. (2) Has the all basic functions needed by a beginner to intermediate biker to track their progress / measure their improvement. (3) Reliable and consistent (at first) as long as the cyclometer is properly set up for you bike and is firmly seated into the mount. CONS: (1) Poor build quality and plastics, especially the mount, which means this cyclometer's measurements will become unreliable in the long run. (2) The mount is only suitable for the handlebar; if you want to attach the cyclometer to the stem, you have to look elsewhere (or make modifications to the mount). DETAIL: I've purchased 4 of these and/or their Bell twins, both wired and wireless models, and installed them on 4 bikes. After going thru cold winter riding season followed by hot summer rides (e. g, about a year), ALL of them started getting loose in the mount, causing unreliable readings as the cyclometer would lose then regain contact to the mount as the bicycle hit bumps in the road. Identical rides would be measured at 26. 7 miles one day, 18. 4 miles the next and 21. 8 miles the third. Average speeds would vary by 3-4 mph from day to day, when my watch showed that I was covering a fixed course at in the same amount of time. VERY frustrating. QUICK FIX: If you choose to buy this cyclometer and eventually start to experience reliability problems, try using a thin rubber band to hold the cyclometer firmly to the mount. After I did that the readings became reliable / consistent again and the cyclometer has yet to fall out of the mount, no matter how hard a bump I've hit. Safe biking!