The differences between a WiFi booster, WiFi extender and WiFi repeater.
Aim Dynamics.How Does a Wifi Extender Work
EDIMAX - Wi-Fi Range Extenders - N300 - N300 Universal Smart Wi-Fi Extender/Access Point
Amazon.com: WiFi Extender, Long Range Signal WiFi Booster for Home by 4 Super Antennas, 2.4Ghz Amplifier Wireless Repeater with Internet Ethernet Port,Coverage up to 9200Sq.ft Work with 99% WiFi Routers (N300-B) :