DFRobot Raspberry Pi WiFi 150M Miniature 802.11n USB Dongle 94 but there are probably many

but there are probably many other cool uses

and simple graphics

1 × Gas Sensor MQ6 Analog Propane For Arduino

Key details include Input Voltage: DC 4

DFRobot Raspberry Pi WiFi 150M Miniature 802.11n USB Dongle 94 but there are probably manyTiny USB WiFi adapter for the Raspberry Pi and other single board computers. 802. 11n at up to 150Mbps on 2. 4GHz. Specs Standard 802. 11b g n Speed Up to 150 Mbps Band 2. 4 GHz Chipset Realtek RTL8188CUS Interface USB 2. 0 (backward compatible) Security WEP, WPA, WPA2, WPS Works with Pi, Cubieboard, Radxa Rock, PC RTL8188CUS driver ships in most Pi distros, so it usually comes up with no extra setup.