I ordered the 4 " patch to see what it would do because my daughter was having rotaor cuff surgery Tuesday the 10th.The pain block wore off in the night and she had a hard time getting the pain back under control. The patch arrived Wed and I took it to her. We held it on her neck and after a few minutes the pain lessened in her arm and the arm relaxed. We taped it on her neck with first aid tape. She called this morning, Thursday, and no pain and she slept all night!! When I saw that thin piece of black patch, I was glad I had the refund option. Had no idea what miraculous relief it would give. Thank you for this technology.

V. Packer