Our Opinion

• Chest Straps  -----    Sark Products let's the customer choose the transmitter of their choice at no additional cost. We recommend the Cardiosport because you can easily change the battery and it comes with a lifetime warranty.  All transmitters are compatible with all watches except, Polar and Cardiosport transmitters do not work with Acumen watches.  You must have a Polar coded transmitter to work with Polar's Cycling models S725, S625, S720, S520 Xtrainer and Protrainer XT  
• Changing battery in watch should be done by us or someone who can leak test watch.   Simply, if the watch is not leak tight corrosion will develop when moisture gets inside.

  

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  Mio Shape + Cardiosport Impulse  (No Chest Strap)