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Elastic back Velcro allows you to adjust to any size chair to massage your back
4 powerful deep-kneading massage nodes
Selectable Direction with Heating
3 Adjustable Speed
30 Days Money Back and 12-month worry-free warranty
Ive had another brand of very similar for years. I use it in my office when I have a sore back. I usedit for an hour straight when I first got it. Felt tender for a couple of day. If you build up usage time over a week or so and you avoid will feeling bruised by it. I can run it by the hour now. Really gets the heat into your back too.