Hydrocollator Heating Unit- Mobile- M-4 - 24 Packs Model M-4 * Perfect for the large physical therapy clinic or hospital * Comes with (24) standard Moist heat steam packs * 20 W X 34.88 L X 33 H * Durable and easy to maintain - stainless steel * Non-Digital * Assures a constant temperature * Fully warranted * U.L. listed CSA certified no plumbing neede *