Excellent condition. 23" high x 20" wide x 1-1/2" deep. $35 firm.
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Cost new: $130 plus tax and shipping: https://www.embraceair.com/products/embraceair-king
To see how it works, go to www.embraceair.com/back-supports. (Note this is an earlier version and has a twist type valve instead of a push button as shown on the website.)