Biddeford heated mattress pad cotton/poly, CALIFORNIA KING. Biddeford heated mattress pad deluxe 50/50 polycotton quilt-top, CALIFORNIA KING. Advanced digital controller with PerfecTemp sensor controls temperature to within 1/2 degree. Silent solid state control is easy to operate and has 10 warmth settings, 10 hour auto-off, digital display, and last temperature memory. Control measures approximately 4.75" L x 3.00" W x 2.25" H.