Wireless Heating Pad: Compared to other plug-in heating pads, portable heating pads offer rechargeable battery packs and integrated pockets that you can use in bed, work, cooking, chores or outdoors without being stuck in one place and enjoying freedom of movement.HEATING IN SECONDS: This battery powered heating pad comes with a 7.4V 4200 mAh large capacity battery pack and 3-stage heating for most needs, even heat distribution, 5s fast heating, up to about 6 hours of low running time Settings (113F/45C), 5 hours medium (131F/55C), 4 hours high (149F/65C). (If you are looking for more needs, consider ordering spare batteries in our store. ASIN: B09CPXFTCP).Heating Pad for Back Pain Relief: Heated Back Bracket adopts the latest heating technology, which can quickly heat to improve blood circulation and relieve low back pain, waist, abdomen, stomach, cramps, sciatica, you will feel relieved within minutes of your use .Adjustable shoulder straps and hands-free: Large heating pad Dimensions: (8 x 21). This heating pad for cramps features adjustable Velcro and elastic that stretch from 25 to 63 inches to fit all waist sizes.Smart security settings: long press the button for 3 seconds to turn on/off. The default is high temperature when turned on. It will automatically switch to medium temperature after 5 minutes of inactivity. If you need high heat, push the button to the red light yourself.