A fort­night with…

Ma­trix Pow­er­watch X

Runner's World (UK) - - Gear -

£263.80, www1.techinthe­bas­ket.com

DAY 1 The chief in­no­va­tion in this watch is that it’s pow­ered by your body heat, us­ing ther­mo­elec­tric tech­nol­ogy, so it never needs charging. This is very im­pres­sive.

DAY 2 It’s rather heavy and a lit­tle cum­ber­some – it may be too chunky for run­ners with small wrists.

DAY 5 Of­fers steps, stop­watch and calo­rie-burn func­tions. A ‘run mode’ mea­sures dis­tance but only us­ing an in­ter­nal ac­celerom­e­ter, which is about 85 per cent ac­cu­rate. DAY 6 Mes­sage no­ti­fi­ca­tions are frus­trat­ing: they tell you who has mes­saged but they don’t dis­play the text.

DAY 8 The calo­rie-burn func­tion seems ac­cu­rate when com­pared with num­bers from other de­vices. How­ever, the sleep func­tion­al­ity is ex­as­per­at­ingly vari­able – it works on some nights but not oth­ers.

DAY 11 Haven’t worn the watch for a cou­ple of days but stored power and data are saved for 12 months with­out you wear­ing it.

DAY 14 Ver­dict: this is a vi­sion of the fu­ture of these de­vices, but it needs to be fur­ther de­vel­oped. It will do the job for early adopters who are ca­sual ex­er­cis­ers, but it is prob­a­bly not so­phis­ti­cated enough for keen run­ners. ••••••••••

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