Secondhand AAT C-Max Stair Climber

Objective AI Report

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Report date: 01.12.2025

AAT C-max Stair Climber Device Analysis Report

Device Identification

The product examined in the visuals is an electric-powered mobile stair climber device with an integrated seat, designed to safely transport individuals with mobility limitations up and down stairs. While resembling a standard wheelchair, the product distinguishes itself from standard chairs with a special climbing mechanism located under the seat, balance wheels, and a control unit on the rear push handles.

Brand and Model

As a result of detailed visual analysis, the brand and model of the device have been identified as follows:

• Brand: AAT (Alber Antriebstechnik) – Clearly understood from the logo embroidered on the fabric of the product’s backrest, the “AAT” logo on the yellow label on the motor unit, and the “aat-online.de” web address.
• Model: C-max – The “c-max” inscription in orange and white colors is clearly visible next to the brand logo on the backrest fabric.

Authenticity

The “AAT” logo embroidery on the product, the industrial standard yellow warning labels on the motor housing, the unique blue control handle design, and the quality of the chassis structure indicate that the product is an original AAT product.

Usage Areas

This device is designed for the transfer of patients, elderly, and disabled individuals between floors in buildings without elevators or within homes. Used under the control of an attendant, this product allows for transportation on many types of stairs, including spiral staircases, without lifting the person from the seat.

Quantity Information

The visuals show 1 (one) AAT C-max stair climber device. The device is an integrated system.

General Condition

The device is generally in “used” condition. While its physical integrity appears complete, there are signs of use and superficial wear. Metal components and plastic parts are in place but do not have the luster of a new product.

Physical Deformation

• Metal Footrest Panel: The metal section where feet are placed shows noticeable dullness and superficial friction marks due to use.
• Wheels: The gray tires show darkening and dirt due to contact with the ground, but no deep cracks or fragmentation are observed in the tires.
• Chassis: Slight friction marks and dirt accumulation have been observed on the metal tube chassis, especially on the lower parts and at the wheel connection points.
• Motor Housing Cover: The outer surface of the black motor/battery housing shows small scratches and signs of use.

Mechanical Components

The lower legs and wheel system, which form the product’s climbing mechanism, are visually complete. The attendant’s push handles are in place. The brake mechanism, footrest, and armrest connection points appear sturdy. The tension of the backrest is adequate.

Electronic Components

At the end of the right-hand push handle, there is an electronic control unit with a blue body and yellow buttons, used to operate the device. Under the seat, there is the main body containing the motor block and the electronic driver unit. The spiral cable connection from the control unit to the main body is present in the visual, and no breakage is observed.

Accessories

• Safety Belts: A black safety belt system (providing chest and waist support) that wraps around the user’s body for safety is present on the device and is attached.
• Armrests: Black plastic armrests are present on the sides.
• Headrest: A separate headrest attachment is not visible in the visuals.

Battery Status

At the rear of the device’s motor unit (under the seat), there is a vertically positioned, black, rectangular battery box (power pack). While the chemical status of the battery (lifespan, charge retention capacity) cannot be determined by visual inspection, no signs of swelling, melting, or acid leakage are observed in its physical casing.

Label Information

The information on the yellow/black striped safety label on the motor unit is as follows:

• User Warning: “May be operated by instructed personnel only!”
• Capacity: “Max. capacity 120 kg”
• Manual Warning: “Refer to instruction manual before operating!”
• Safety Warning: “Attention!!! Check brakes before using device on stairs!”
• Company Information: AAT logo and aat-online.de website.

Screen Analysis

It cannot be fully determined from the visuals whether a digital screen is present on the blue unit of the control handle, but buttons for speed adjustment and direction are present.

Dimensions and Compatibility

The product dimensions are suitable for the transfer of an adult individual. The maximum carrying capacity of 120 kg is clearly stated on the label, indicating its suitability for most adult patients.

Year of Manufacture

A label directly indicating the Date of Manufacture is not clearly legible in the visuals. However, the design language of the device’s chassis and the “c-max” logo suggests that this model belongs to an earlier generation of AAT products (one preceding the current versions).

Documents

No physical documents such as an invoice, warranty certificate, or user manual are present in the visuals. Given its used condition, the likelihood of it being under warranty is low according to visual evidence.

Potential Malfunction Risk

Although the device appears visually sound and ready for use, it possesses a safety-critical mechanism (stair climbing). The wear and dirt observed on the ground-contacting surfaces of the lower climbing feet and tires indicate that the device has been actively used. In mechanical products of this type, it is common for rubber wheels to harden over time or for the battery to lose performance. Although no serious breaks or rust are visible, it is recommended that the brakes and climbing feet undergo a professional inspection before the device is used on stairs.