Cold Rush holistic design features a durable motor, a stronger flow rate than the top selling units and an industry-leading ice to water ratio that ensures longer cooling times. Yet, it is whisper quiet and compact, weighing just 4.6 lbs (2.1 kilograms). By incorporating the same durable motor used in much larger mobile air conditioners and refrigerators, Cold Rush provides consistent cooling and excellent compression, even to high elevations. Quiet as a whisper. Cold Rush uses a brushless motor to produce a whisper-quiet (30 decibel) unit that allows patients to get the rest they need to properly rehabilitate from their injuries. Stay cooler, longer. The highest ice-to-water ratio in the industry and a design that produces less heat transfer from the motor to the water combine to ensure cold therapy pain relief for up to 6 continuous hours. Cold Rush was designed holistically, with unique features like a locking lid to help prevent spills and insulated walls for improved cooling. Includes a brand new knee pad.