After searching high and low for a replacement to my Pacepal clock, I really really wanted this personal clock to work on a lot of levels. My dashed hopes include:
1. The clock face is too small to be read by more than one lane.
2. The control buttons are hard to read and understand, and did not correspond to the instructions I had.
3. After the clock is in the case, there are no buttons on the case to make adjustments. Therefore, one must stop one's workout, dry off at least one's hands, unscrew the tight screws, be careful not to get the clock wet, make adjustments via the difficult-to-see-and-understand buttons, then do the process in reverse in order to continue.
4. If charged for "too long", the clock ceases to work. The electronics konk out.

However, the customer service was sincere and attempted to help. But parts of this help was delivered in a patronizing manner, i.e. "Oh, it works great for so many and they have no problem with any of your issues..." so that left a bit of a condescending, off-putting taste in my mouth. There was a promise of "a case that you can use the buttons from the outside is in the works" but nothing is available. I waited a long time to write this review because I was hoping things would improve. Alas, I have come to this conclusion and will look elsewhere for a suitable underwater/waterproof clock to use poolside.

Been using Swim Nerd clocks for many years at 2 different facilities. Seamless, movable or mountable, they connect to each other and stay on same time when one is used as the master. Can use app and run workouts. So much versatility. #1 Benefit is the customer service. If you have a problem, they will help you and they will make it right! Best customer service in the business! They make you feel valued.

I am so happy with my swim nerd products. So reliable and easy to use. On top of that the customer service made me feel like a friend not a customer. I would recommend swim nerd to everyone!

I want to take a moment to share the great things the Swimnerd clocks offer.

The Swimnerd Pace clock works Wonderfully! I've seen for the recreational swimmers the clocks help gauge where the swimmer's training times are as they explore fundamental techniques and help understand what works best for them...you can change your stroke rate, kicking frequency, and many, many more things and while very easily knowing your time with the clearest display of numbers on the Swimnerd Pace Clock.
For swimmers that are more competitive, we are generally always looking to get faster. But how do you know if you are getting faster if you don't know your times, or just can't read them easily and quickly during a practice!
Get a Swimnerd Pace clock!

Previously had a different brand. The other brand of clock was old and outdated, we do still use it from time to time. We bought a pair of these to install in better locations. Connection was seemless, cannot connect to both clocks on the app at the same time, but you can connect to one clock and if the clocks are connected, both clocks will respond via the app (as long as you are connected to whichever one you made the master clock). Had a problem with them loosing connection over time or maybe someone else messed with it. I called to hotline to help and they figured out the exact problem, someone changed the channel of it. Walked me through a simple fix and it was done. The only thing I could ask is for a less flimsy remote. The ones provided are cheap! It works, but resembles how cheap those LED strip light remotes are.

I'd absolutely recommend this product to anyone in need of a new clock. If you are getting multiple, get the wifi and bluetooth ones. They won't talk to each other if you don't.