Tenda A8 is perfect Repeater as it has 3 modes. Hotel, Residence and Wireless Repeater.
The best part is it has WAN/LAN and LAN ports and a USB Port. So even if your wi-fi router does not have a good reach U can than use the LAN cable from your base router to connect to this repeater and than it will distribute the signal over wi-fi enabling you to connect your WI-FI devices.
USB port can be used to charge your Smart Devices and Gadgets and hence is an ideal add-on available.