NEW Far Infrared Heating Pad, Natural Jade and 2 Different Tourmaline Heating Pad, Electric Heating Pads for Back Neck Shoulders and Abdomen, Auto Shut Off Function, 23.6" X 15.7" Natural jade and 2 kinds of tourmaline Contains 72 stones. It contains 52 pieces of natural jade, 8 pieces of brown tourmaline, and 12 pieces of black tourmaline. The three stones have different functions, which can better strengthen negative ions and far-infrared rays. Leather surface & sturdy edges Easy-to-operate controller The controller is easier to operate. It contains 3-stop time settings: 2H/4H/6H, which can be adjusted by pressing the button. With 9-stop temperature setting: 59℉/68℉/77℉/86℉/95℉/104℉/113℉/122℉/131℉, just turn the button on top to adjust to the corresponding temperature stop. After turning it on, please adjust the temperature level to the ninth level, wait for a few minutes, and then adjust the level to the level you think is comfortable. Tips for use： Please read the manual carefully before use. The length of the power cord is 83 inches, providing greater freedom of use. When using must be separated by a towel or clothing, do not directly touch the side containing jade with the skin to prevent burns. Do not fold the heating pad when using, otherwise it is easy to burn the heating wire. Jade needs a certain heating time, so you need to switch to the highest temperature gear after turning on the power, and wait at least 5 minutes to reach a certain temperature.