A 1.5x telephoto converter is a front-mounted accessory lens that screws into a 37mm filter thread and makes your camera’s lens appear about 1.5x longer, giving a narrower angle of view for more reach.

Because it uses a 37mm thread, it’s most likely intended for a compact camera or small-lens setup rather than a larger interchangeable-lens camera.

As for quality: these front-mounted converters are generally of limited value. They often reduce image quality compared with using the lens alone, and they can also reduce the amount of light reaching the camera, which makes them most usable in bright lighting. Tiffen versions are generally considered better than the worst no-name options, but they’re still not usually regarded as high-quality optics.

So yes, it can be used to add a bit of telephoto “zoom,” but don’t expect great sharpness or low-light performance.