Key points for clear image projection: 1. This product is primarily positioned as an entertainment and optical imaging learning device; it is a simple projection device and cannot be compared to a dedicated projector. 2. Projection onto a smooth, white wall yields better results. For a more ideal image, please purchase a low-lumen ambient light rejecting screen separately. 3. The darker the environment, the better the effect. The image may appear dark at first; it takes time to adjust. 4. Set your phone to its brightest setting and HD display; ideally, use a phone without a screen protector. 5. For devices, please remove the protective film from the reflector. 6. When using, adjust the focus knob according to the image distance to achieve the clearest image. 6.1) If the image is upside down, simply flip the phone. Note: This is direct projection from the phone screen; it must be used in a completely dark environment. Color: Black Material: ABS Package Contents: 1 * Mobile phone video amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.