With the Runtastic Receiver and Heart Rate Monitor, featuring the new soft elastic chest strap, your heart rate data will be recorded and shown directly in the Runtastic app - making your training and tracking as efficient and simple as possible. So that you are able to listen to music during your fitness activities, a headphone jack is conveniently built into the Runtastic receiver. And, as always, your stats will be clearly presented and stored for you on Runtastic.com. Thus you have a perfect, easy-to-use training diary, enriched by your new heart rate data!*Compatible Apps*Runtastic PRO*Road Bike PRO*Mountain Bike PRO*Supported Devices:*iPhone: iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s, iPhone 4*Android: Android 2.1 or higher*Blackberry: 8330m, 8350i, 8900, 9000, 9100, 9105, 9300, 9700, 9780, 9788*Windows Phone: OS 7.5*Weight: 65g Heart Rate Monitor + 7.5g Receiver