Sun glass mp3 player Compatible formats: mp3, wma, adpcm Flash memory size: 256mb, 512mb, 1gb Standard usb port Integrated usb drive Play function: play in order, pause, resume playing Delete function: delete current or all songs or Recordings Integrated microphone supporting adpcm recording Continuous playing time: 8 hours Recharging time: 2 hours 230mah/3.7v macromolecule polymer li-ion recharging battery Automatically detected battery voltage and capacity Battery consumption saving function: Automatic power off if no button pushed in 2 minutes under pause status Automatic power off in 2 minutes when all tracks played Outer packing: 50pcs/ctn Carton dimensions:44 x 39 x 55cm G.W.:12.5kg