Soundcore - by Anker Boom 2 IPX7 Waterproof Floatable 80W Bluetooth Speaker with Subwoofer, BassUp 2.0, & Custom RGB Light Effects - Blue

Yes, it has a 3.5mm aux input. You can connect a portable CD player using a standard 3.5mm aux cable, as long as the CD player has a headphone or line-out jack.

The activation of Transparency Mode on the Soundcore P30i can be done manually. While no direct mention is made of compatibility with an iPhone SE, such devices typically work seamlessly with modern Bluetooth earbuds and their features, so it should work as expected. Once Transparency Mode is activated (either through the earbuds button or the Soundcore app), it remains active until you manually switch to another mode (like Noise Cancelling or Normal mode). You can use the "NC" button or the app to toggle between the modes. If you are using the Transparency Mode while playing music, keep in mind that although it lets in natural ambient sounds, it does not amplify them, and you may need to lower or pause the music for clearer conversations.

Yes, this speaker has 2.1 stereo clarity.

This speaker can output a maximum of 80 watts.

This speaker uses bluetooth version 5.3.