What is jbl 50?

As an AI language model, I am not sure which JBL 50 you're referring to. However, JBL 50 is not a specific product model. JBL is a well-known brand that produces a wide range of audio devices, including headphones, earbuds, smart speakers, wireless speakers, and more. Each of their products may have its own unique specifications and features. If you could provide more specific details about the product you're asking about, I might be able to give you a more accurate answer.