When you think of wireless speakers, you think of smaller, Bluetooth-enabled devices (such as the Jambox Jawbone, or the Sonos Play:1, etc.), aimed a providing some good sound for music stored on tablets, phones, etc. These speakers are not like those systems.
The KEF X300A speakers are huge speakers – they look more like giant audio system speakers you’d have connected to your older audio system (if you still had a receiver, record player, cassette deck, etc.) They’re very heavy – when you get these, decide quickly where you want them and keep them there – portable speakers these are not.
(See a full writeup of this product.)