Noise Canceling BHF02 Bluetooth Handsfree Headset for PC

This is new, without box. It's a little big for my head (I have a small head), and so it doesn't sit correctly on my ear. I really never used it, but also threw away the box not imagining that would be an issue.. so I wasn't able to return it! About this item Plug and Play: Plug this BHF02 USB Audio Transmitter into your computer USB port and set the BHF02 headset into pairing mode; the Bluetooth connection will be completed within 2-3 minutes, then you could enjoy the handsfree calling via the computer BLUETOOTH V5.0 and Long Working time: Lower power consumption and wider compatibility. 400mAh Battery Built-in rechargeable 400mAh battery, you could enjoy the handsfree calling up to 30 hours on a single full charge NOISE Cancelling MICROPHONE INCLUDED: Has flexible noise cancelling microphone that eliminates all the background noise Included Components: 1xBesign BHF02 Bluetooth Headset, 1xPC Adapter, 1xUSB Charging Cable User Manual: https://manuals.plus/design/bhf02-bluetooth-handsfree-headset-manual