"A $30 toy that accepts a 4K signal and projects a 480p reality."
The '4K 1080P Support' claim means the device can receive a high-resolution video signal, but it will be compressed and displayed at its true, unstated native resolution, which is likely blurry and pixelated.
This is a justifiable purchase only as a disposable toy for a child's room or for a non-critical task like projecting a static image for wall art tracing. Its value is entirely in its extremely low price, not its performance.
Anyone expecting to watch movies from services like Netflix or Disney+ should avoid this due to content protection blockers. If you require a clear, bright picture for a presentation or home viewing, this device is not a viable option.