Just Tested it and it works flawlessly in both 2.4GHz and 5GHz. It had very little usage and was kept in good condition.
The NETGEAR Nighthawk X4S EX7500 Tri-Band WiFi Range Extender in white is a high-speed wireless extender that provides reliable connectivity for your devices. With its tri-band technology and frequencies of 2.4 GHz and 5 GHz, it ensures seamless and fast internet access throughout your home or office. The NETGEAR brand reputation guarantees quality and performance, making this range extender a great choice for expanding your WiFi coverage and improving network connectivity.