Built-in Player: MP3/Radio Playback Modes: Normal, Repeat One, Folder, Repeat Folder, Repeat All, Random, Intro Tuner Bands: FM Output Power: 2 x 3 Watts RMS @ 10% THD Speaker Diameter: 1.77" AUX Input: Yes Headphone Jack: 3.5mm Features: SDHC and MicroSDHC Expansion Slots to 16GB exFAT supported Standard 3.5mm Line Out Socket Standard USB 1.1/2.0 Plug Microphone Built-in Button Controls Speaker Frequency Response: 150-18000Hz (±3db) Speaker Signal and Noise Ratio: =80db Speaker Magnetic Resistance: 4 Ohms Audio Format Support: MP3 / WMA ID Tag Support EQ Modes: Natural, Rock, Pop, Classic, Soft, Jazz, DBB, SRS-WOW FM Record Voice Recorder Calendar Clock Alarm