Free Delivery over £30* | Free Click & Collect at Decathlon Stores | 365 Days to Return
Reference : 8374970
Add to my wish list
Product already added

KALENJI ONstart 710 Stopwatch - black

was £24.99 -%


This price includes a recycling fee for electrical equipment and batteries DecathlonDeeeTaxMentionAfterPrice / Since

From To

* Sales from to Until end of stock
* From and limited stock
£24.99 -%
This price includes a recycling fee for electrical equipment and batteries DecathlonDeeeTaxMentionAfterPrice / Since

* From To

* Sales from to Until end of stock
* From and limited stock
Check availability in store
This stopwatch is designed for intensive athletes or trainers looking for accurate training performance statistics. It's the most complete stopwatch in our range and has three countdowns, a pacer, stroke and speed s and 300 split times.
  • Stand-by mode
  • Back-light and large numbers
  • Rain isn't a problem

Technical Information

Stopwatch with up to 300 saved lap times

Up to 99h59min59s and 300 split times (split and lap).
The stopwatch measures the following:
1/ split times = SPLIT: the time elapsed since the start,
2/ lap times = LAP: the time elapsed since the last lap time measurement.


When using the stopwatch, 300 split times and lap times are memorised. They can be recalled, whether the stopwatch is running or not.
You can view the following in the memory:
the fastest lap time, the slowest lap time, the average lap time out of the X saved times, the last lap time, the penultimate lap time, etc.

COACH countdown

Create your training session to manage your efforts:
- your warm-up time (WARM UP)
- your acceleration / fast exercises time (RUN)
- your recovery / slow exercises time (REST)
- the number of RUN and REST in a series (REPEAT)
- the number of RUN+REST exercise series (SERIES)
- your time between 2 series of exercises RUN+REST (BREAK)
- your end-of-session / stretching time (COOL).
Up to 99 series and 99 repetitions.

MATCH countdown

Countdown with several programmable times (up to 9 blocks and 99 repetitions).
Perfect for refereeing a match with several periods of play.

UP & DOWN countdown

Countdown associated with a stopwatch. At the end of the countdown, the stopwatch starts automatically. Perfect when starting a race with a countdown (e.g. at a sailing regatta).

SPEED function: speed measurement

Using a known programmed distance and your recorded time, you will can view your speed in km/h or miles/h
The stopwatch measures LAPS (the time from your latest partial time measurement until the current moment) in SPEED mode.

STROKE function: measurement of the stroke rate

The STROKE function is used to count the number of movements per minute of an activity (strokes in rowing or swimming, strides in running).
Set the number of strokes to be measured, start the stopwatch and you can view the average frequency in Beats Per Minute (BPM) for the period.

PACER function:stride pace

The PACER means you can set a pace per minute with beeps at set intervals. It is combined with a stopwatch.
Set the required rate (between 1 and 240 beeps minute) and the stopwatch will beep at this rate to give you the pace.

Perfect visibility in all conditions

Big screen with a 3-row display.
Back-lighting makes it easy to read at night.


This product is waterproof at 1 ATM, i.e. resistant to rain and use in a damp atmosphere such as a pool.

Specially designed for comfort and precision

The ergonomics of this stopwatch have been carefully designed so that the buttons are accessible and can be used with precision.
The design of the stopwatch and its lightweight construction mean you can hold it comfortably in your hand.
Because it is crucial to know precisely whether you have activated the stopwatch, you will hear a click when you press a button.
The wide strap will let you keep it comfortably around your neck.

Save your battery

your stopwatch will not stay on forever at the bottom of your bag.
It automatically goes to stand-by mode after 24 hours.
You can also switch to stand-by mode manually.

How to choose the right stopwatch.

The range:
- OnStart 110: stopwatch with 1 split time, time, date, alarm
- On Start 310: stopwatch with 50 split times, MATCH mode, COACH mode, UP & DOWN mode, speed pacer, rain resistant
- On Start 710: stopwatch with 300 split times, MATCH mode, COACH mode, UP & DOWN mode, speed pacer, pace tracker, speed tracker, rain resistant, light
- On Start:

See more See less

Composition / advice

80.00% Acrylonitrile butadiene styrene (ABS), 20.00% Acrylic (PAN)
Inside room
80.00% PCBA, 20.00% Battery Lithium

Our commitments

Test Product For 20 years now, the Geonaute teams have been designing stopwatches specifically for sports use. During development, each model undergoes more than 30 different tests in the laboratory as well as some tests in the field conducted by our teams of testers.
Guarantee : Essential parts (battery) available: 2 years

Product benefits

Parameter measurement Time, date, alarm, back-lighting and large digits.
Waterproof Rainproof (1 ATM)
Coaching 3 countdown modes depending on your sport: MATCH, COACH and UP&DOWN
Versatility 1/100s stopwatch with 300 split times (split & lap)
Adjustable PACE, SPEED and STROKE measurements
Autonomy Automatic or manual stand-by mode for optimising battery life
Easy reading Large digits for perfect legibility when practising sports.
Easy maintenance Manual opening makes it easy to replace the battery.

Your reviews

Reviews by our Team Members

Our customers pictures

Your reviews

Our services

ONstart 710 Stopwatch
Maintenance and repair
Maintenance and repair
ONstart 710 Stopwatch
Because you look after your own health, we look after that of your products: tips for initial settings, maintenance and repair advice, video tutorials, FAQs, instructions...
See our tips Spare parts