This medium-sized far infrared heating pad is designed to relieve discomfort in the shoulder, back, and waist in just one session—no need for multiple treatments. Experience the calming benefits of negative ions emitted from tourmaline, creating a sensation similar to stepping into a peaceful forest. * Far infrared emitted from hot jade and tourmaline penetrates deeper into tissues and joints compared to traditional electric heat pads. * Far infrared rays help reduce discomfort and inflammation, promote relaxation, reduce stress, and improve sleep quality. * Tourmaline emits the highest level of negative ions among all crystals, aiding in detoxification, reducing depression, and stimulating circulation. * Jade and tourmaline work together to improve sleep, boost immunity, and rejuvenate you. * Adjustable temperature from 86°F to 158°F with three timer settings: 4hrs, 8hrs, 12hrs. * Use the back heater pad while lying on the bed, relaxing on the sofa, or working in the office. * Low EMF for your safety.