- Concept2 Indoor Rower or SkiErg with a PM4 running firmware version 317 or 28 or later.
- Wahoo Key, available from wahoofitness.com. This device provides an ANT wireless connection to the PM4 for receiving the PM4 data.
- A compatible iOS device (for using the VoiceOver feature):
- iPhone 3GS
- iPhone 4
- iPod touch 4G
Note: Excluding the VoiceOver feature, ErgBuddy may also work on iPhone 3G and older iPod touches. Concept2 does not test or support these older configurations.