视频中展示了一双手正在操作一个电池盒。电池盒内装有两节电池，手指轻轻旋转电池盒，使电池的正负极对准相应的触点。电池盒上有一个箭头指示正确的安装方向，确保电池正确安装以保证设备正常工作。背景为浅色，突出显示了电池和电池盒的细节。
The video shows a pair of hands holding a battery holder with two batteries inside. The hands rotate the battery holder, revealing the orientation and placement of the batteries within the holder. The batteries are labeled with "120" and have arrows indicating their correct insertion direction. The background is plain and white, focusing attention on the battery holder and the hands manipulating it.
A person holds a film cartridge with both hands, positioning it horizontally. The person begins to rotate the cartridge, causing the film inside to move. As the rotation continues, an arrow symbol appears on the film, indicating the direction of movement. The person completes the rotation, and the arrow symbol remains visible on the film. Finally, the person flips the cartridge to a vertical position, showing the arrow symbol clearly.