Hi DT! The HW-B650F does offer wireless features, but it does need to be plugged in to work.
The included subwoofer connects wirelessly to the soundbar (no audio cable between them), and you can also stream audio wirelessly via Bluetooth from a compatible TV or mobile device. However, both the soundbar and the subwoofer must be connected to a power outlet, as they are not battery-powered.
~ Samsung Solutions