I bought this product primarily to keep track of my riding distance. After installing and inputting all my info (wheel size, maintenance schedule, weight, age, etc), I determined I might as well have flushed $10 down the toilet .... that would have been more interesting to watch than the zero on the odometer/speedometer that never changed as I rode. Tried remounting the magnet as close to the sensor as I could without them knocking into each other; no change, no indication that the comp unit was getting any impulses from down there. Oh well, at least the clock worked.... although another problem is when the sun shines brightly on the LC display, it seems to make all the characters visible, even when the unit is powered off. Not too easy to read that way.

Only conclusion I can come to is I got a unit with a bum sensor, but it didn't encourage me to replace it with the same type of device, especially after reading other reviews about its questionable accuracy. A tad feature-bloated for this user, my next purchase will be something more mechanical with basic functions. Sometimes low tech is preferable, especially when pedaling ones self around! 2 stars

the only reason this is not getting five stars is because i need to ensure the longevity of this speedometer.

but the pertinent features of this speedometer-- like speed and distance-- work quite well.

Installation is easy and securing the stage to the bicycle itself is simple. Parts and such seem sturdy.

The instrument's speeds and distances are not only accurate, but precise-- computer measures thousandths of miles! An interesting feature is that the computer seems to know when you are walking beside your bicycle-- when i walked beside the bike through a hallway it only registered distances in hundredths of miles instead of thousandths and didn't register a speed in mph even though it recorded these small distances.

The thermometer works well but is slow to register accurate temps, at least in the summertime (range minimum is 32 F-- pretty lousy). But this, the calorie and fat burning calculators are all frivolous features which have nothing to do with the speedometer's central purpose.

The computer's face has large, easy-to-read digits and the LCD screen is backlit, but the instruction manual does not indicate how to activate the backlight. The LCD backlight stays lit for about 5 seconds then deactivates-- similar to the old "indiGLO" watches in the 1990's. The backlight is pretty weak and difficult to read at night anyway, so I've incorporated a separate, small lamp to illuminate the computer's face during night rides which is a vast improvement.

Switching between modes/features on the computer is a little confusing since the instruction manual does not accurately describe how to properly utilize all of its functions.

overall, I look forward to many rides with this instrument on board my bike. I recommend this purchase over the lesser-priced Bell products or the cheap things from Wal-Mart. Well worth the $30. 4 stars

I've owned two of these and ridden in all 4 seasons, driving rain, blinding snow, and even the occasional sunny, warm day. I've never had a problem with either, and find them very easy to set up and calibrate, easy to use, and totally accurate, dependable and reliable.

Under $10! Can't be beat! Ride on!! 5 stars

This bike computer, for the price, is by far the best on the market. How do I know? Because there is no other bike computer that boasts a name brand company, has as many features, and costs as little as this one! I made sure to read all the reviews on Amazon before I purchased this, and I find it disheartening that I was almost swayed to *not* buy it. Fortunately, I read between the lines of all the negative comments and figured their age and/or grammar explained why they had difficulties with the device.

To start, almost everyone is correct in stating it's difficult to install; honestly, it is! The instructions suggest a 1mm distance between the magnet and the sensor, which basically means: as close as you can get it without the two pieces hitting! To achieve this, the task takes a considerable amount of fiddling, but once you find the right spot on the fork and spoke to where they come closest without hitting, you're golden. I spent about 10 minutes doing this. After the magnet and sensor were on, the setup of the computer was a breeze. It asked for wheel diameter (which is required if you want accurate readings of speed, distance, etc), age, weight, time settings, etc. If you read the instructions, it will explain how to set each of these values.

I want to address a few of the complaints on this page. The first was from a young man who said he was riding 60 mph. Your problem: you didn't set the correct wheel diameter! The instructions provide you a handy chart to tell you what code to type in based on the corresponding diameter. Now, if you don't know what a diameter is, or don't have the intelligence to look it up online, you probably shouldn't be using this computer in the first place. If your wheel is 26" and you set it to 15", yes, you will not have the correct and accurate display of your speed!

I read another review that said he couldn't figure out what buttons to push. Answer: READ THE DIRECTIONS! The directions tell you what to push, for how long, and when. They do this for all displays and all features. If you can't figure that out, I don't know what else to tell you. Honestly, there are 2 buttons, are you that stupid?

I read another review that said distance traveled couldn't be reset, nor could the calories or fat burned. WRONG! Yet again, people fail to actually *read* the instructions, and have the nerve to come online and submit a negative review. There are 7 displays that are shuffled with the *right* button. The *odometer* display does not reset, because it's just that, an odometer. Do you reset your car odometer, too? What you're looking for is the *tripmeter* display. The tripmeter can be reset by holding the *left* button for 2 to 3 seconds. When you reset the tripmeter, you also reset the trip timer, and the average speed value which was set during your previous trip. To reset the calories burned or fat burned, go to that feature display, and hold the left button for 2 to 3 seconds. Simple enough?

In summary: this computer is accurate in all its features if you read the instructions and input the correct wheel diameter. Speed, distance traveled, average speed, trip timer, temperature, and everything else, I have found to be 100% accurate. I checked the speeds against a driver and the temperature against a 3rd party thermostat. Since I've only used this product for a couple weeks, I can't tell you how durable or what's its longevity will be, but if the features and accuracy mean anything, I should be using this computer for a long time.

Quick note to everyone who set this thing up wrong and feels foolish for complaining: if you input the wrong diameter, press both buttons down at the same time for 3 seconds and it will reset the whole device so you can input data from scratch. If your speedometer is reading out "0.0" while you ride, you have the sensor and magnet setup wrong. Try to align the magnet with the arrow next to the "Sensor" text.

The key to having a pleasurable experience with this bike computer is to read the instructions. If you don't feel like reading instructions, don't buy this. If you feel you can bare with the idea of reading a bit and want a great piece of hardware at the lowest price on the market, BUY this device. 5 stars

Has more functions than others yet less expensive. Works great! Displays time, distance travelled, speed and other useful stuff. 5 stars