The wr1 is a wireless receiver and a wireless transmitter that measures a 60mm radius and is 40mm deep it can be used together to create a simple wireless zone extension or it can enable wireless rear speakers to a home theatre system the wr1 receiver will be able to plug into the inputs of a remote subwoofer or amplifier and is an ultra compact module which can be placed hidden away behind any other equipments a non slip silicon rubber bass has been designed to leave any marks or unessces