18 * Never again worry about where the pad is or if it is positioned correctly * The pressure sensor pad is sealed right inside the wheelchair seat * Durable reinforced vinyl with steel side-stays * Fits all popular sling-seat wheelchairs * Easily identify these sling seats by the red tag sewn on the back of the sling * Unconditional one-year guarantee * Sleek Black color * System is shipped complete including replacement seat/alarm alarm box mesh mounting bag and 9V battery * Not for use with heavy gel cushions * 6 Month Warranty *