Wagan IN9501 Wagan Go Relax Massaging Lumbar Cushion 2 cushions in one: lumbar support plus massage via vibrating acupressure relief for your lower back and spine 6 acupressure nodes are activated when you lean against it to provide a gentle massage Material: black leather and polyurethane foam for this high-density cushion Compact size: 12.5" x 12.5" x 2.5" and weighs only 1 lb. so it can be easily transported from vehicle, office and home Requires 2 AA batteries (not included)