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Get better Control on Social Make Better Friends & Improve your Health Monitor your Heart Rate & understand Stress Levels to Improve Chats & Social Networking In order to measure your heartrate, you must place finger over the camera+flash. The keyboard itself does not take the measurements but the camera+flash. NOTE: Works best on iPhones with flash including iPhone 4/5/6/7/8/X/11 NOTE: Make sure that your fingertip completely covers the camera lens. Press gently, since pressing too hard reduces blood flow in your finger and it’s harder to get a result. Make sure that your fingers are not cold. This app is for recreational and fitness use only. * NOT INTENDED FOR MEDICAL USE, FOR FITNESS USE ONLY. This app is intended for recreational use. It is not intended for medical diagnoses or similar purposes. The content is not to be seen as medical advice. If you need medical attention please consult a doctor or call 9-1-1 PRIVACY www.getdoublevision.com/privacy EULA www.getdoublevision.com/eula