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SL500 Swimming Pool Watch with Distance / Lengths / Chronometer

Sale price: $26.00 Regular price: $29.99

Tired of counting your lengths and calculating the distance traveled?The SL500 exclusive algorithm means it can count lengths in the pool, whatever stroke you are doing, even kickboard swimming!

Color: Select a color
Size: Select a size
Sale price: $26.00 Regular price: $29.99

Free shipping over $49

Final Sale: No returns or exchanges

See our return rules

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8548394

Product Videos

Product Features

A photo of the SL500 Swimming Pool Watch with Distance / Lengths / Chronometer in use

SL500 Swimming Pool Watch with Distance / Lengths / Chronometer | Our design teams have developed the SL500 watch for intermediate swimmers wanting to vary their sessions, to focus on their progress and their swimming.

Tired of counting your lengths and calculating the distance traveled?The SL500 exclusive algorithm means it can count lengths in the pool, whatever stroke you are doing, even kickboard swimming!

Measurement settings

Measure your distance, your lengths, and your time in 82', 108', and 164' pools.


Benefit from a waterproofing up to 100' and buttons that can be used underwater.

Salt water resistant

Rest assured, the SL500 withstands chlorinated water, seawater &perspiration.

Easy to use

Easily configure the SL500 with the on-screen menus and 2 buttons.

Easy to open/close

Only open the back cover to easily change the batteries by yourself.

Questions & Answers

Product Customer Reviews

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296 Reviews
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SL500 Swimming Pool Watch with Distance / Lengths / Chronometer,base color
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makes up its own mind what its doing

Idid everything right but it just wont count laps,it did halfway through swim then stopped.Also i saw a tom cruise film where he disarmed a nuclear bomb, it was easier than trying to follow this watches instructions,and im an electronic technician! sending it back.

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Does not count brass...

I am a regular swimmer crawl and brass, crawl length are counted brass totally ignored...for rest it is OK for a cheap ish watch very limited features...have had it for 4 days only but suspect battery will be an issue since e there is no off buttons, buy cheap buy twice my mum always used to say!

Doesn't count lengths accurately

Bought and used it today. Swam 30 lengths of 25m pool - watch says I did 33. Thanks for the extra metres but I would prefer better accuracy - 10% error is not acceptable. Will be returning it and asking for a refund as not sure I will trust another one and as I expect I'd end up counting them in my head anyway. Items like this need to be 99% reliable on accuracy. I have a target of swimming a mile and would be gutted if the watch said 64 lengths done but in fact I'd only done 57 or 58.

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Amazing watch

Just what I've been looking for so I don't have to keep counting the lengths I'm doing. easy to use and comfortable



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Watch does not count laps correctly

Looks nice and comfortable around the arm but this watch cannot count laps correctly. 65 laps recorded as 71.

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Excellent value for money

All the functionality I need. Really accurate length counting. Perfect thing for little money.

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a new timer for me

well i got to the pool today with my new NABAIJI POOL WATCH i was a little worried at first but not any more it is a great bit of kit spot on with the lengths i did only 50 but i am working on that no more pushing a little timer for me thank you so much for this a great price and does the job

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Nabaiji Pool watch

This watch would have been perfect if a normal buckle and tang had been used everything works perfectly and it never misses a length. Easy to use display and really like the ability to turn off after use rather than use battery when not in use. As mentioned me only negative is the press stud buckle arrangement this is fiddly to fasten and takes much longer than a normal buckle would. Cannot understand why this arrangement was used.

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Nabaiji sl500

Does the job - nice and simple bit of kit that works well

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Fab watch, no lengths missed

This brand was purchased to replace another brand that seemed incapable of recording the correct number of lengths swum, despite swapping the hand in was on or gliding for longer at each end. I had low expectations, but have been so very pleased with the way this watch works. It records the lengths well and in large 'print' so even without my glasses on I can see how many I have done. The price is half of what I paid for the other brand, so am delighted with it. My only gripe is the instructions are not very easy to follow, so have had to muddle through. If they had been clearer with some commentary as well as pictures I would have given it 5 stars.

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Everything I've purchased from Decathlon has been great but this swim watch missed the mark. The set buttons stick out too far and they are too sensitive. At the slightest bump the watch goes into set mode and messes up the time keeping. Also the band pops open easily because it doesn't have a practical catch mechanism. Retuned it for a refund and as usual Decathlon staff were accommodating and understanding.

Good value, sometimes misses the count by 1-2

For 24 euro I can't fault it. I was sick of counting, so this give me a rough estimate on how many laps I've done. Occasionally it reports 1-2 lengths off what it should be, but for a casual swimmer I can tolerate that.

time not accurate

I m wearing it to swim first time. after swim all ok. But when home at 9pm the time show 12am. Otherwise , i like the measure length function.

Not recommended

No proper instructions. The button wears off easily

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Hello Siang Chew,

Thank you very much for your feedback.

I'm really sorry that you didn't have a good experience with your swimming watch.

At Decathlon, we want to give our users the best value for money and will definitely share your feedback with the development team.

They will improve the user manual and durability.

In the meantime, you'll be very welcome at any of our stores to get a refund or exchange for your watch.

Fabrice, Watersports Commercial Sport Leader.

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Additional Product Information


Strap: 100.0% Thermoplastic polyurethane ; Chassis: 100.0% Polycarbonate ; Electronic circuit: 100.0% PCBA ; Lens: 100.0% Polymethyl Methacrylate ; battery: 100.0% Alloy ; Sliding bar: 100.0% Acrylonitrile butadiene styrene

Precision of measurement

The SL500 swimming watch counts your lengths with a reliability of over 95%, using sensors that are sensitive to movements.We recommend that you press Start when you start swimming and Pause as soon as you stop for greater precision.Note: Failure to follow these recommendations may produce inaccurate measurements.

Measures all 4 strokes and lengths with a kickboard.

The SL500 watch measures lengths when swimming the breaststroke, crawl, backstroke, and butterfly, but also lengths with a kickboard.

Wrist size

The SL500 watch fits wrist diameters of between 5.1” and 7.9”.

Storage instructions

Remove the battery before lengthy periods of storage (more than 2 weeks).


2 years



Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


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