Stair chair (SC-1) Specification: 1) The electromagnetic brake is automatically activated when the caretaker releases the control handle. 2) The chest and legs are securely strapped for safe riding. 3) Stair Chair can be operated manually on its four wheels on flat ground. 4) Easily operated with no effort when going up or down the stairs. 5) Small, sealed lead acid battery is used in battery pack. There is no risk of fluid leaking and no maintenance (replacing water, etc) is required other than charging. 6) In case of heavy use, 2 or more batteries can be swapped when the battery get low. 7) Can easily be folded up by a touch of a button, taking up less space when storing. 8) 12V battery charger is included. This special charger automatically charges depending on the discharge level of the batteries. It will stop charging once battery voltage reaches a certain level during charging. 9) No need to install tracks on stairs.