Spree Bluetooth Fitness Heart Rate Monitor Headband placement gives you the most accurate reading for body temperature, heart rate and calories burned Keeps you from injury or health risk by finding your optimum zone for intensity, body temperature, and movement The only workout device with body temperature monitoring so you get an effective workout without risk of over heating Soft touch silicone band comfortably conforms to your forehead to block sweat, Spree app monitors your performance, and keeps track of your workout. Spree App for Android (4.4.2 and up - Samsung Galaxy S3 & up, HTC One M8, LG G3), iOS (iPhone 4S & up, iPod/iPad 3 & up) and selected 3rd-party apps