Smiths Medical HOTLINE 3 Blood and Fluid Warmer, || Reorder Numbers: HL-390 || Product Usage: || The Micro-switch is used on the HOTLINE¿ 3 Blood and Fluid Warmer. This product, for use in conjunction with HOTLINE¿ 3 L-370 Fluid Warming Set are intended for the delivery of warmed blood and intravenous fluids at normothermic temperatures. These products are intended for use by appropriately trained healthcare professionals in clinical environments