Etekcity 5R2 2 pack Mini USB Wireless WiFi LAN Network Adapter, 802.11 b/g/n, 150 Mbps, 2.4 GHz frequency, built in RTL 8188 Chipset, great for Windows, Linux, MAC, PC Built in USB / Compact and portable, Plug and Play Advanced Security Types: WEP 64/128, WPA/WPA2, WPA PSK/WPA2-PSK Transmission distance: Indoor 100m/Outdoor 300m(depending on environment) Operating Voltage: DC 5V0.2V Environmental Parameters: Operating Temperature:0~40, Storage Temperature: -40~70. Operating Humidity: 10%~90%RH, Noncondensing:5%~90%RH