POLAR Verity Sense Red, Optical Heart Rate Monitor Armband, Model 920110148, Versatile Sensor for Any Sport & Exercise, Including Swimming, 30 hours Battery Life

COMFORT: Polar Verity Sense keeps your wrist free for maximum comfort and freedom of movement. Just slip it on your upper or lower arm, clip it on your goggles or place it snug and firm against your skin under tight-fitting clothing. CONVENIENCE: With only one button, using Polar Verity Sense couldn't be easier. Only 3cm wide, and less than 1cm thin: it’s hard to believe that something so tiny could hold such immense power. MULTIPLE CONNECTIVITY OPTIONS: Live heart rate broadcasting, 2 simultaneous Bluetooth channels, limitless ANT plus connections, and compatible with a host of 3rd party apps. VERSATILITY: Polar Verity Sense suits countless different applications. You can either follow your heart rate in real time on a connected device or app or record your session and transfer your data to your phone afterwards. ACCURACY: Verity Sense is able to accurately track heart rate when placed against the skin on your upper arm, forearm, or can be clipped to goggles.