The Bioness H200 Wireless is a neuro-prosthetic device that uses functional electrical stimulation (FES) to activate the nerves that control the muscles in your hand and forearm. This device can help If you have issues related to reaching, grasping, or opening and closing your hand because of one of the following conditions: Stroke Traumatic brain injury Spinal cord injury Certain neurological disorders The back battery cover is not in it but I have it.. be remedied easily. The battery's (2) are rechargeable ( charger can be found on Amazon) . Charge lasts for quite some time though. The unit only cost 6,200 and typically insurance does not cover this expense.