VEVOR Sewer Camera, 98 ft/30m, 4.3" Drain Inspection Camera, IP68 Waterproof Snake Plumbing Camera with Lights - 6 Adjustable LEDs, 4500mAh Battery & 16GB Card for Sewer Line Duct Pipes

This endoscope's head lacks an active steering function. When entering a 90° bend, the camera passively deflects along the pipe's curve, only passively deflecting as the cable pushes along the pipe's physical bend.

Self-balancing means that no matter how the lens rotates or twists inside the pipe, the image on the screen remains upright and does not flip; non-self-balancing means that the image rotates by the same degree as the lens rotates, and if the lens is twisted inside the pipe, the image will be upside down and rotate randomly.