Sony Smartwatch3 In-Depth

The Sony Smartwatch 3 gets the smartwatchcity treatment…

We conducted a number of tests for which we devised the methods ourselves as stated. We do not claim these to be clinically accurate nor statistically significant (several thousands of tests under a variety of laboratory conditions would be necessary to give those sorts of results), however we feel they give a broad representation of the integrity of the units.


Connection quality

Smartwatches which are tethered via Bluetooth to smartphones do occasionally lose the connection. This is unfortunately an unavoidable fact of life. This can be due to the connection being disrupted, or because the watch has strayed too far from the phone. What is crucial, however, is how quickly that connection is then re-established.
Test: to test this, we deliberately broke the connection between watch and phone by progressively increasing the distance between them (in a straight, unobstructed line-of-sight) until the watch indicated that it had disconnected from the phone. We noted this distance, and then brought the watch back into proximity to the phone and measured the length of time it took to re-connect to the watch automatically:

Disconnection distance: >10m

Time to automatically reconnect: instant

Battery & Charging

420mAh battery, micro-USB connector right on the back!




Time to charge: 95% in 0.5 hour, 100% in 1 hour

Battery life on minimum use: 120 hours (turned on but unconnected to phone and in standby mode, checked every 12 hours for < 3 secs just to check battery level)

Battery life on average normal use: 40 hours (about 50 notifications per day plus steps, heart rate, searches, notes – averaged over 5 work-days usage)


 Voice recognition

Test: time taken to complete action via voice command, tested 1) in an absolutely quiet room then 2) in busy London rush-hour traffic (roadside, Marble Arch, 5 pm weekday) – averaged 5 attempts each test. N.B, where the unit failed to correctly recognise the command, a penalty time of 20 secs was entered, and it is noted how many failures occurred out of the 5 attempts:

“Show me my steps” – Quiet: 5.2 seconds, Noisy: 3.8 Seconds

“Show me pictures of monkeys” (always fun) – Quiet: 4.8 seconds, Noisy: 3 Seconds

“Note to self; drink more water” – Quiet: 3 seconds, Noisy: 5.4 Seconds

“Set alarm for half-an-hour” – Quiet: 3.2 seconds, Noisy: 4.8 Seconds

“What is the population of Lithuania?” – Quiet: 5.4 seconds, Noisy: 13.2 Seconds

An overall average time of Quiet: 4.32 seconds (no fails), Noisy: 6.04 Seconds (total 3 fails)


Pedometer Accuracy

Test: Conducted by walking 1000 paces in a straight line along a high street (at a quiet time) in a brisk, striding manner, arms swinging, in order to maximise step detection:

Steps average variation: 15  (a variability of 1.5%)

In normal activity testing, where uniform strides were not used, the accuracy was very poor with a variability of over 50%. This was found with all of the watches we tested.


Read the review