Heating Element only for M4 Mattress Overlays Toppers * Variable Speed * This MSHQ SA9086MD * Variable Speed * This version of our Jeanie Rub allows you to vary the speed of the massager from 1400 to 4600 rpm * Lower speeds deliver a more soothing massage while faster speeds are more invigorating * Features an easily adjustable switch placed conveniently near your finger tips * Provides deep penetrating action that safely relaxes tight muscles and stimulates circulation for all body types * Ideal for personal health fitness and sports massage * The accessory posts allow you to add precise trigger point and pressure point therapy to your massge * Item has a 1 yr warranty allowing you to recognize and boost speech over background noise and manually adjust the volume depending on the environment you're in Hydrocollator M4 Heating Element 1500W 120V Replacement Kit * Kit comes with Heating Element (2) Washers (2) Nuts & (2) Replacement Terminals if needed * Fits Model M4 Hydrocollator * Original Factory Replace Part * 1500W 120V