Lightweight & Compact Design Make it the Perfect On-The-Go Speaker. Inputs: USB Flash Drive / TF Card, iPod Loading Dock, 1/8'' (MP3). FM Scan Tuner. rechargeable Lithium-ion battery. 5V USB Loading dock with cable included. USB flash drive maximum size: 16GB. TF Card maximum size: 16GB. Plays .mp3, .wav files from USB / TF Card inputs. iPod will charge while sitting loading dock when USB charging cable is connected. Battery fully charges in about 3-4 hours. Next, Previous Track, Play/Pause Controls. Battery Powered. Remote Control included. Color: Silver. Length: 6''. Height: 2.25''. Depth: 2''