Tigra Heart Rate Belt Bluetooth 4.0 Smart Sensor Train more effectively with the Smart Heart Sensor. When worn around your chest during an activity, it wirelessly transmits your heart rate to your compatible device for instant feedback on how hard you're working. The Smart Heart Sensor is designed to work with the latest smart devices equipped with Bluetooth 4.0 technology. Also known as low energy Bluetooth, this new wireless transmission allows sensors to be used for months if not years without changing batteries. Once it's paired with your compatible device the first time, it will automatically recognize it each time. And it's optimized for use in crowded areas like the gym and road races, so it won't pick up any signals but your own. The strap is made of a soft fabric for more comfort. The size is adjustable to your body so it stays secure during your activity. Features Latest Bluetooth 4.0 (Bluetooth Smart) technology Ultra-low power consumption (battery life 250+ days*) Replaceable battery Reception range 3 meters No cross-talk or radio interference Works with any Bluetooth Smart ready devices such as iPhone 5/4S, iPad Mini & iPad 4 Comfortable, elastic all-fabric chest strap Hand washable Easy snap-on transmitter unit Waterproof housing Fits chest size of 60-130cm * Assuming 1 hour of use per day Compatible with iPhone 4S, iPhone 5/5C/5S, iPod touch (5th generation), iPad (3rd & 4th generation), iPad mini Compatible with selected devices using Android 4.3 or later (HTC: One, One M8, One Mini; LG: G2, Nexus 4, Nexus 5; Motorola: Moto G, Moto X; Samsung Galaxy: S3, S4 and S5, Note II, Note III; Sony: Xperia Z1)