The link in the app with my Galaxy S4 Samusung went smoothly (first is not displayed directly in the settings, simply select the Runstatic Bluetooth Smart Combo chest strap, the Polar is selectable on the next page). For this, the chest strap must also be applied before that. A previous moistening belt (as in the guide) is advisable.
While running my smartphone is housed in a sleeve pocket. Disconnections I have not found.
I can not say anything about the battery life up to now.
I would recommend this product uneinegschränkt further !!!