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HeartMath Inner Balance Coherence ear sensor - $100
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Plug into your iPhone’s Lightning port
Open the app, clamp the sensor to your earlobe, follow prompts to breathe and focus to relieve stress and anxiety
Company’s website: https://store.heartmath.com/inner-balance-lightning/?srsltid=AfmBOopdxxF56JADovgJ_9R0w9LDqMzod-_pG8-FioAAQjrRsfhD0yH9