Gateway Solid Surface Portable 3G Ramp 4' Aluminum Traction Kits Accessories 0 A @ 12 VDC) 4012SC 0 A @ 12 VDC) * Internal Battery Average Charge Time: 4 Hours * Oxygen Concentration: 87 to 95% @ 5 l min setting within 4 to 6 minutes * Environmental Conditions: Temperature Range: 41¯F to 104¯F (5¯C to 40¯C) The MicroFit Mirage™ Hearing Aids are so small The lightweight heavy duty aluminum means you don't have to worry about maintenance and ensures the Gateway Solid Surface Portable Ramp can be used in even the harshest of weather conditions * The lightweight heavy duty aluminum is more durable than wood allowing you to repeatedly use the ramp every day without worrying about deterioration * The one piece design of the Gateway Solid Surface Portable Ramp means no assembly is required * All you have to do is set it in place and it's ready for use * Slip resistant surface * Designed with a permanent extruded slip resistant surface the Gateway Solid Surface Portable Ramp makes sure that wheels don't lose traction removing the worry of wheels slipping on the ramp * Useable size: 4'x36 x3 5 * Weight: 30 lbs * Weight capacity: 850 lbs * Usage guidelines suggest using this on heights up to 6 * Does not include the handrail