"The AirDrive Keylogger is an ultra-small USB keylogger, only 0.8"" (20mm) in length. It can be accessed with any Wi-Fi device such as a computer, laptop, tablet, or smartphone.

Link: http://www.keelog.com/hardware-keylogger/ »

Features:

-) Records keystrokes from any USB keyboardAirDrive Keylogger

-) 16MB internal flash memory

-) 100% stealthy, undetectable for security software

-) Supports over 40 national keyboard layouts

-) Compatible with barcode readers

-) Works as a Wi-Fi hotspot

-) Connect from any computer, smartphone, or tablet

-) Access data from web browser, no software or app necessary

-) Retrieve data remotely without touching the device

-) Simple and clear WWW interface

-) Supports WEP, WPA, and WPA-2 network security

-) Memory protected by hardware encryption"