It looks like a lens of reflex camera, but you can not use it on a camera. However, if you want to use it to play songs, the realistic cam lens Bluetooth speaker will help you.
This is an interesting portable speaker that measures 67mm by 68mm diameter and weights 217g. As we can see from the images, the wireless speaker is shaped as a DSLR camera lens, and comes with nice details from a real camera lens. Of course, you can’t apply it onto your DSLR camera, but built-in 45mm speaker driver with 5W output produces nice sound for your favorite music, and using integrated Bluetooth technology the portable speaker can wirelessly connect with your smartphone or Bluetooth-enabled music player, while an extra audio input allows it to connect with any music player with 3.5mm audio jack, and the Bluetooth speaker also features a built-in microSD card slot so it doubles as a MP3 player. Apart from that, the wireless speaker is powered by built-in rechargeable battery.
The DSLR camera lens shaped wireless speaker is priced at $47 USD. If you’re interested, jump to USBGeek online store for more details.
Additionally, if you need other options you might like to check the TARDIS wireless speaker and more via “wireless speaker” tag.