Yup, this nifty little thing is really called a "hole warmer." And why? If you are going to use a masturbation sleeve, this allows you to enjoy different temperature sensations.
Click the metal disc in the Hole Warmer to activate. Insert the heated Hole Warmer in your Tenga masturbation sleeve for about five minutes. Before use, please check the temperature by touch, to make sure it is comfortable. It is possible to reuse the Hole Warmer, see enclosed instructions.
Note: this product doesn't include the pictured Cup.