HeartMath emWave2 XW Helps build resilience and increase energy Promotes focus, mental clarity and emotional balance. Use emWave2 on the go as a portable training device and store your sessions for later review. Run a session while at your computer and watch your coherence through real-time charts. Store all session information on your computer for future comparison and review. Four challenge levels including a challenging advanced user mode. Make sessions entertaining with the coherence building tools. Suitable for Windows and Mac OS