It is simple and reliable. With the addition of ice (or frozen water bottles) and water, you will enjoy 8-10 hours of effortless cold therapy for post surgery or sore back, sore neck, sore joints, or sore muscles. Each comes with 2 velcro straps, power supply, and original owner's manual. Both work great, but we don't need them anymore. These sell for almost $200 new. Asking $65 each, or any reasonable offer. Feel free to call or text show contact info
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