Clear verdict: AirPods and w04 casings are not universal due to their different shapes and sizes.
Explanation: The AirPods and w04 have different shapes and sizes. AirPods are Apple's true wireless earphones with an integrated design, while the w04 is a regular wireless earphone from some manufacturers with a different look and size from AirPods. Therefore, their protective shells are not universal.
Some wireless headphone cases can be universal, but you need to make sure they are the same shape and size to effectively protect the headset and be easy to carry. At the same time, when purchasing the protective shell, it is necessary to pay attention to whether it is compatible with the version of the headset, so as to avoid incompatibility or inconvenience.
How to do it: If you want to buy cases for wireless headphones such as AirPods and w04, you can learn about the version and size of the headphones, and then purchase cases specifically designed for these models online or in a physical store. When in use, the protective shell should also be correctly installed and removed according to the instructions for the use of the protective shell to avoid damage to the headset.
On this question, it is not universal. AirPods and W04 are different in size and shape, and they require different protective cases to accommodate their unique size and shape. The AirPods' protective case cannot be used with the W04, and vice versa.
Not universal, the two devices because they are not the same size so you can not use the same case.