The Tourna Air Cell Armband pinpoints compression where you need it with a pressure pillow that delivers 50% more relief to the painful area. Working immediately, Air Cell provides pneumatic pressure that relieves tennis elbow pain. Tennis elbow pain can vary from person to person; simply position the Air Cell directly above the area in pain and tighten the elastic strap. Your muscles should be relaxed. The elastic strap makes the Armband very comfortable. Be sure not to over tighten so you do not effect circulation in the arm. An anti pinch flap is incorporated to prevent your skin from being pinched. Full rehabilitation directions are included in the package.