ShareThe Watchman device is made of metal. For safety, keep the PEMF device away from the heart area and any metal implants to avoid potential interference. Was this article helpful to you? Related Articles What are the benefits of using PEMF during regular rest time? Does stronger PEMF always mean better? What is the best time to use PEMF? What makes Big Magic different from other PEMF options? Is there a best time of day to use PEMF? Can PEMF help with low energy? Leave a Reply Click here to cancel reply. Name (required) Email (will not be published) (required) Website Comment Δ