The Echomax X and XS active radar reflectors are both designed to recognise radar band X (9.3-9.5GHz) and, in the case of the XS, radar band S (2.9-3.1GHz) by receiving and amplifying a transmitted echo. This amplified echo is sent back on the same frequency instantaneously.increasing the radar detection zone. visibility of small echoes and reducing the risk of collision.Supplied without bracket.Only on order.