1. Data received from 5.3KHZ and 4.0 Bluetooth can work at the same time without interfering which can monitor your sport intensity and heart rate beat data it can be connected with all device with 5.3 HKZ compliance. 2. Support IPHONE product (iOS 6.0 4S 5S iTOUCH 5 IPAD 3 / 4 5C IPAD MINI) and 5.3 heart rate watches Compatible with Polar. 3. Free Wahoo Fitness App for running and cycling Free to Download Alatech ,Wahoo,3.2.1Run,Endomond Mysports MapMyRide Sports Tracker Strava from IPHONE Store. 4. Data Transmission distance:5.3k is 10 meters4.0 Bluetooth is about 20meters. 5. Heart Rate detecting Range:40-240bpm 6. New LED indicator function is to remind the Bluetooth connection state for your chest belt.