Karaoke feature? I am not sure if that is something you want to brag about. Regardless, the MP3 player is your average flash based player that sells on Transcends website for $87 and $117 for a half a gig and a gig including shipping and taxes.
The 520 supports MP3, WMA, and WAV file formats. It also has voice recording, line-in recording and an OLED screen. The player also comes with a 10 pack of reusable earplugs for when you use the karaoke feature.
Transcends main goal with this product was make it a full featured pen drive, primary to it being an eye pleasing audio player. On the pen drive side of the features, the T.Sonic will allow you to partition and password protect your data, act as a bootable device, and perform as a key to lock up your PC.
On the digital audio player side it will play MP3 and WMA formats. The internal Li-ion battery charges via USB and will run for a claimed 18 hours. The web site also mentions that the internal battery is replaceable by a service not by the user. Another unique feature is the players touch pad controller on the front. It also has what I think to be one of the best features which should be standard on all MP3 players, headphones out = power off.
The 512MB version sells for $78 and the 1GB version sells for $119.