Using these ThermaBliss self - heating ceramic shells is easy. First, charge them with a thermaBliss charger to get up to 90 minutes of heat or cool them for up to 30 minutes of chilled therapy. Then start your massage session. Remember to scan the QR code on the packaging for free virtual live training to enhance your massage skills. For cleaning, use a Prevention Disinfectant Wipe (VT507) between treatments to keep the shells hygienic. The non - porous surface makes it quick and easy to sanitize. Keep in mind that the shells come with a 1 - year warranty, so if you have any issues, you're covered.