It is not possible for WeWALK’s ultrasonic sensor to detect drops at ground level such as stairs, curbs, and holes. It is therefore important to maintain good traditional cane skills when using WeWALK to locate drops. WeWALK may not detect soft fabrics or small obstacles at the limit of the range setting. WeWALK works best with hard surfaces as these provide a stronger ultrasonic echo. To customize the obstacle detection sensor’s distance, you can visit the preferences page in the mobile app.