- Standard on the Model E Indoor Rower
- Available as an option when buying a new SkiErg, Model D or Dynamic Indoor Rower
- Can be retrofitted to Models D, C, B and A Indoor Rowers
- Equipped with rechargeable battery pack when purchased with a new machine. The rechargeable battery pack is not included in retrofit kits, because using a PM4 on older machines requires the use of two D-Cell batteries.
- Can take two D-Cell batteries
- Compatible with Garmin, Suunto and ANT SPORT chest belts
- Compatible with Polar heart rate equipment when Concept2 heart rate receiver and cable in use