Recently I bought the supermini VMAI M100S projector, which is only the size of AirPods and can be put in a bag or pocket for easy carrying. It can be used for business trips, watching movies, and office presentations.
Although the body is small, it is fully functional. It has Ai voice control and the screen will be automatically calibrated, and you can start broadcasting as soon as you set it. Mobile phones, iPads, and computers can all cast screens. It supports a power bank power supply and can be used for two hours without plugging in.
You can also connect it to Bluetooth speakers such as HomePod to enhance the viewing experience.
Jason