- Bluetooth 4.0 - Wirelessly Measures Your Steps and Strides - Footpod/Sensor (attaches to your shoe/shoelace for measuring Steps/Cadence) - Accurate Measurement and Wireless Data Transmission - Tracks Every Impact Between Your Foot and the Floor - Download the App, 'APA COACH+' free via 'App Store' - Also compatible with other training and fitness APPs - Works for iOS Devices Only (iPhone 4S, iPhone 5, iPad, iPad mini) - Improves Your Training & Performance - Provides Instant Wireless Feedback & Data - Quickly and Easily Attaches to Your Shoe - Improve Your Performance and Experience by Making Your Training More Fun - Batteries: 1 x Button Cell (Type: CR2032)