After the first synchronization performed on IOS (settings / Bluetooth and turn on Bluetooth) it only remains to select the cardio is all the coupling is not a problem on iPhone 5 or 4s is perfect no connection failure during the activity that's perfect.
The unit will store your match information you do more action to achieve if not enable Bluetooth, the application supports once start to recognize and take charge coupled cardio, simple and very effective.
With summer and my running sessions by 28 ° C is I felt any discomfort or irritation due to contact from the strap on the skin and even sweating.
The joint use of GPS and Bluetooth do not strike the autonomy of the iPhone (Bluetooth Smart is really efficient).
It is fully waterproof to 1.5m, I rinsed thoroughly (belt and transmitter) after use no problem found so far.
Reliable product whose strengths are:
User replaceable battery (3 volt CR2032: very common and good to walk)
An impressive range of compatible applications (Runmeter, RunKeeper, Cyclemeter, Endomondo, Runtastic ...)
The Bluetooth Smart 4 (energy efficient).
Immediately recognized by the iPhone 5.
In practice the information is reliable and the device works perfectly, the weak point of the shoulder straps are well on the elastic material that tends to relax with time their price is a factor to take into account when replacing 20 USD from the manufacturer's website.
To: quality, reliability, autonomy, ease of use.
Against: the difficulty at this time to find a chest strap replacement.
Conclusion: really good product designed by athletes for athletes who has the particularity of being compatible with a number of impressive application, daily use and maintenance are very simple it's a nice alternative to a brand of cardio very known as Polar, the use of Bluetooth Smart (energy efficient) allows to gain autonomy when using the device coupled to the GPS module.
