From the Manufacturer
Within the sleek metal case of the iRiver SlimX 550 you'll find the highest level of quality and industry leading features like 32-minute skip-free playback, a built-in FM tuner, and extended battery life up to 55 hours.

Features:

• Plays MP3, WMA and ASF music files
• Plays standard audio CDs
• Listen to hundreds of songs on one CD
• Built-in digital FM tuner
• 32-minute skip-free playback
• Rechargeable batteries with built-in charger
• Up to 55 hours of battery life
• Optical output to connect to other audio devices
• Upgradeable to future formats and features
• One-year limited warranty
• Includes remote control with backlit LCD, iRiver earphones, carrying case, car cassette and power adapter, 2 NiMH rechargeable batteries, AC adapter, AA battery adapter, headphone adapter, printed user manual
• No. of channels: Two (stereo L+R)
• Frequency Range (Audio): 20Hz - 20KHz
• Frequency Range (FM Tuner): 87.5MHz - 108MHz
• Dimensions: Approx. 128 x 136 x 13.7 mm