3M Littmann Classic III Steth Gray 27 (Each) Arm Leg Exercisers Single Channel * Microprocessor controlled 16 7136 Single Channel * Microprocessor controlled * Auto step through program * Four duty cycles: 5 5 5 10 10 10 10 20 * Four frequencies: 12 5 * Capacity: 600 lbs * Two sided chestpiece with tunable diaphragms on both the adult and pediatric sides * Single piece tunable diaphragm is easy to attach and easier to clean because its surface is smooth without crevices * Pediatric side converts to a traditional open bell by replacing the single piece diaphragm with a non chill rim * Next generation tubing provides longer life due to improved resistance to skin oils and alcohol less likely to pick up stains