Velcro Seatbelt Alarm: This restraint-free seatbelt alarm has a Velcro® closure and as self-release pull strap. The belt mounts directly to the wheelchair frame. When the Velcro on the belt is disconnected, the alarm will sound, notifying the staff that the patient is trying to exit the chair. Available in two sizes. Uses 9V battery (included). 36" - 46".