The Wahoo Key is a must-have accessory for iPhone 4S users who want to connect to ANT fitness sensors like heart rate monitors, cycling speed & cadence sensors, and power meters. This allows you to easily track and analyze your workout data using your iPhone app.

• Connects iPhone 4S to ANT fitness sensors
• Compatible with heart rate monitors, cycling speed & cadence sensors, and power meters
• Allows for easy data tracking and analysis