The ASL 913L Swing Away Mechanism mounts to an ASL 105 Electronic Head Array, Comfort, Ultra or Otto Bock style headrest on the left side. It is an ideal switch mount for someone to have a switch site at their cheek or chin. It can swing away for transfers and always locks back into the same place. It is designed to fit the ASL 204 Proximity Sensor in Spot Pad, ASL 300 Egg Switch or ASL 312 Microlite Switch. Switch Not Included. Must Specify Headrest and Mount Type.