has almost identical features to the iriver H300 Series. The X5 includes a color screen on the unit. As with the M3, there is an "L" version which is 4 mm thicker and has a longer battery life. Unlike the M3, the X5 comes in 20, 30, and 60 GB variants. It is likely that there will be no 60 GB X5L, as the 60 GB X5 itself is the thickness of the 20 and 30 GB X5L due to the increased size of the hard drive. The 20, 30, and 60 GB capacities offer a rated battery life of 14 hours for audio playback with a 950 mAh battery. The 20 and 30 GB X5L models specify a rated playback time of 35 hours with a 2250 mAh battery. Video battery life is unspecified. In addition to the "L" versions, the X5 also comes in a "V" variation, which lacks the FM radio. Cowon announced in May 2007 that the X5 series had been discontinued. Its successor, the X7 series, was slated to be released at some point in the summer of 2007, but was delayed until October 2010. iAUDIO M5 The iAUDIO M5 is basically a simplified version of the X5. It lacks an FM Radio, a colour screen (it has a greyscale screen instead), and USB-OTG functionality to save production costs. Its casing is a silver color instead of the black X5. There's also an "L" version available, which features enhanced battery life. The "L" version of the player is a little thicker and heavier though and costs slightly more. iAUDIO F1 Introduced in July 2005, the iAUDIO F1 can be described as an iAUDIO U2 with an interesting design, a colour OLED display, and higher power output (32 mW vs. 20 mW for the U2). The F1 played Vorbis, WMA, WAV, ASF and MP3 files and could tune to the radio, as well as record from the radio. It could also record directly from sources or record using a built in microphone. It came in 256 MB/512 MB/1 GB sizes of Flash memory. iAUDIO U3 Introduced in October 2005, the iAUDIO U3 was the successor to the iAUDIO U2. The main difference between the two players was that the U3 featured a color screen (260,000 colors, 160×128 resolution) which allowed playback of MPEG4 videos encoded in XviD, as well as picture display. Like the iAUDIO X5,