Waterproof Motorcycle Digital Clock, 4-Pack, 1.1 Inch Diameter

I bought this to use skiing. I velcro'd it to a glove, and it works fine.The battery can be replaced. It's a bit of a pain, but doable. Take a razor blade (ideally in a razor blade holder) and carefully run it under the back cover, all the way around. The cover should pop right off. Then take off the plastic strip covering the adjustment buttons. (I'm not sure that's necessary, though.)There is a small metal arm covering the battery. You'll need a TINY Phillips screw driver (and good light). Loosen the screw on one end of the arm, and take off the other two. Don't take the third off, or it will be that much harder to put back together. Swing the arm out of the way and take out the battery. The size is printed on the back cover. I couldn't find the exact size, so I ordered 377's, which worked.Getting the screws back in was a pain. I used a potato chip bag clamp to hold the arm in place, which made it easier to get the screws started. Obviously you'll need to line up the metal contacts with the adjusting holes, then pop the cover back on.

They work. However very small and impractical

They work okay but are literally the size of a quarter. Plus you have to figure out how to change the time on your own with a pin.

These are OK, but come with no instructions and it is almost impossible to figure out how to set them. I finally found in the Amazon Q/A area where someone had outlined the setting procedure, so, then I was able to set them.

I got these for my new power wheelchair. My old chair had a clock on the display but this new super-duper one doesn't and I missed it. I got this particular one because of its small size, ease of installation and clearness of the display. I can now just glance down and know the time like I could before.

Very frustrating and aggravating not being provided any instructions or any other informative paperwork. But through trial and error and after reading the questions on here and reviews I figured it out. My complete instructions below should be copied by the company and sent to all future buyers. Scroll down for my complete instructions.Furthermore, paperwork should be included stating if the battery is replaceable or not. And if it is, what battery it uses so you know which one to buy. And of course instructions on how to get to the battery inside the clocks.One side of the mounting adhesive is pretty difficult to remove the backing. But that's usually the way it goes with these kind of things.When setting the time it has AM and PM time but it does not show on the time display. What's the point unless there's a way to display military time. I haven't figured that out yet if there is a way.The cost seemed very reasonable while I was still assuming that the batteries could be changed. But since that doesn't seem to be an option and other buyers have indicated a very short battery life, it maybe too expensive and a complete waste of time purchasing. If they came with paperwork it would be nice if they told how long the lifespan we could expect of the battery if there's no way to change the batteries. And a return and replace option if the battery fails before the lifespan is reached.INSTRUCTIONS FOR SETTING AND ACTIVATING THESE DDSKY MOTORCYCLE DIGITAL CLOCKS:TOP HOLE = #1, MIDDLE= #2, BOTTOM = #31 Remove white rubber seal but DON'T discard2 Use a toothpick or other pointy object to push in #1 and wait for the wrong date to appear3 Immediately press #2 twice while the wrong date is still being displayed4 Press #1 to advance the month (there is NO way to decrease the number if you overshoot...just keep going until the right number comes up again)5 Push #2 to move to the day of month and repeat steps 4 & 5 until the time is properly set6 Push #3 and hold until the date and time alternatingly display then release (if held too long once they are alternating it will advance to the setting mode again, if this happens, press #2 repeatedly until you are back to this step (#6) again7 Push and hold #1. The seconds of the clock will briefly display before going back to the properly set time with a now blinking colon ( : ) between the hour & minutes8 Reinsert the white rubber seal. It only goes on one way as the prongs are not in a straight line. You may want to mark #1's prong with a paint or ink pen if you are as blind as me.NOTE: As sort of indicated above, I don't see how to open the clock up to replace the button type battery nor do I know how long the battery will last. Wish I had the answers to all that.

I attached one of these little digital clocks to each of 4 clipboards that I use daily at work. They stick on firmly and enable me to keep track of time on different tasks (I can't wear watches). Well worth the price!

Those are very unreliable and inaccurate.Out of the four, one did not work at all.Of those that work, I have two side by side. Within a month they are 9 minutes apart from one another: one is 5 minutes ahead of the actual time and the other is 4 minutes behind the actual time.Cheap, but not worth it.