External webcams can offer a serious boost over the built-in cameras of most laptops. They also tend to add serious bulk. The smallest external webcam ever made, Opal's Tadpole measures just 1.2" squared and attaches with a built-in clip, yet offers serious image quality. The latter is provided by a powerful machine learning ISP system, paired with a 4K, 48-megapixel Sony Exmor RS sensor and an f/1.8 six-element glass lens. An AI-powered VisiMic microphone only captures audio that the camera can see, letting ambient sound waves pass through a sonic tunnel inside the device. It connects to Mac and PC laptops via USB, with a capacitive sensor in the plug that allows for single-tap muting and unmuting of the camera.