The back bandage from Lenz wraps around the lower back helping give you back support and reducing pain. It features two heating elements that are strategically positioned on the kidney and the back area. The design and location of the back bandage gives the user support in their lower back. This bandage comes with Lenz’s larger battery pack which is perfect for those looking for heat emission to last even longer periods of time. The 1300 battery pack will allow your back bandage to emit heat for over seven hours. This back bandage is great for anyone spends a lot of time outdoors and is looking for some pain relief and also wouldn't mind a little support.