This is what I use for a USB Bluetooth dongle: https://www.amazon.com/gp/product/B0775YF36R/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1. It costs $6.99 from Amazon.
To clarify, if your PC already has Bluetooth support, you can just pair the ConnectClip to it.
If your PC does NOT have Bluetooth support, you can either use a USB Bluetooth dongle like above to give your PC the Bluetooth support to pair with your ConnectClip. This does require a little bit of setup on your PC to get it to work, however.
But if you simply need to connect to a 3.5mm female audio plug (in case you donât have USB or itâs not your PC to freely setup however you want), you can just get a 3.5mm male connector Bluetooth transmitter like this one on Amazon https://www.amazon.com/Bluetooth-Transmitter-Receiver-Wireless-Headphone/dp/B07MTFRKQM/ref=sr_1_6?crid=VKAWMRP3UKR5&keywords=3.5mm+bluetooth+transmitter&qid=1569019150&s=electronics&sprefix=3.5mm+bluetooth%2Celectronics%2C194&sr=1-6.