Check Pulse. Sleep Control funktioniert nicht

Measures your heart rate using only phone's camera, whenever and wherever you are. Suitable for everyone. - Hold the tip of your index finger over the back camera lens and flash of your phone. - Do not press too hard or you will restrict circulation which will result in an inaccurate reading. - If your fingers are wet or too cold the app will not work.  Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period.  The account will charge the renewal fee within 24 hours before the end of the current period and determine the renewal fee.  Subscriptions can be managed by the user, and auto-renewal can be turned off by going to the user's account settings after purchase.  No cancellation of the current subscription is allowed during the active subscription period.  Download Sleep Control and start controlling your rest.  It is meant only for fitness use and as a source of general health information.  The app is not designed for medical purposes.  Any unused portion of the free trial period, if provided, will be forfeited when the user purchases a subscription to the publication.