Larger and More Effective: The abdominal massager measures 9.8 inches long by 4 inches wide, with an actual heating area of 2.4 inches by 2.5 inches. Emicool's abdominal massager heats a larger area and is more effective than workout recovery heat cube heaters. The portable heating pad function can be used for everyday aches, pains, stiffness, and muscle soreness. The instant cold compress function can be used for areas that need cooling, injuries, and workout recovery. <br>Hot and Cold Ab Machine: This portable 3-in-1 hot and cold massager combines heat, cold, and massage, using advanced technology to control temperature and a 10-minute automatic timer, making it ideal for workout recovery, muscle relaxation, and pain relief. The 3000mAh high-capacity lithium-ion battery is reusable multiple times and features a very convenient Type-C connector. The Ab Machine's advanced hot and cold contrast method uses low-temperature technology to relieve abdominal pain. Due to technical issues, the app function is temporarily unavailable. Simply update the app after a while. <br>Instant Heat and Cool: The advanced heating pad and cold air blower allow for quick switching between hot and cold. The abdominal heating pad has six heating and cooling modes. The three heating levels range from 93°F to 102°F to 109°F, and the three cooling levels range from 41°F to 50°F to 59°F. This abdominal massager features an elastic band with Velcro (minimum 30.7 inches, maximum 74.8 inches, and a width of 3 inches), making it very comfortable to wear and suitable for most waist sizes. The hot and cold abdominal muscle machine is versatile, not only for the abdomen, but also for the back, thighs, and calves. <br>Cordless Exercise Massage Band: Instant hot and cold pain relief. The 1.8-pound, high-strength band features a compact, cordless design that allows you to carry it anywhere, making it suitable for athletes and daily workouts. Improper use of the elastic can cause pilling; please read the instruction manual carefully before use. <br>LED Color Display: The abdominal massager has 20 massage intensities and four massage modes. You can rotate the middle button to adjust the massage intensity (01-20 levels) and press the middle button to adjust the massage mode (R1-R4). The five white compartments below the numbers represent the power indicator light. When the plug shape appears, it means it needs to be charged. To adjust the three-speed heat/cold function, press the white button next to the display.