The Archos PMA400 is a personal digital assistant (PDA) from Archos, with a hard disk drive and audio and video playback and recording capabilities, so it also functions as a portable media player (PMP). The PMA400 was the most expensive within the line of products that they supplied. Based on the Linux Qtopia Embedded operating system, the device is more like a personal digital assistant than a normal media player. The PMA400 features the following: Though it remains Archos's only dedicated PDA, some of its features can be seen on the later 604WiFi including touchscreen and web browsing.