Specifications: 1) Dimensions (W x D x H): 1.1 x 0.8 x 3.8" 2) Weight: 0.9 oz 3) Sound output mode: stereo 4) Supported digital audio standards: MP3, WAV 5) Headphones: binaural - stereo 6) Microphone: built-in - electret condenser - mono 7) PC interface supported: USB 8) Blue programmable backlit 9) Battery: 1 x battery - AAA type 10) Compatible format: a) MP3: 8KPBS-256KPBS, 16KHz-48KHz b) WAV: 64KPBS, 8KHz 11) Volume adjust: 16 levels 12) Equalizer: Adjustable Bass / Treble / Medium / Super Bass 13) Playing mode: Repeat One, Repeat All, Random, 10-sec Pre-play 14) USB port: USB Spec 1.1 15) Play time: 10 hours (vary with different battery conditions) 16) Display: 96 x 26 LCD with programmable backlit 17) Audio output: 3.5mm headphone jack 18) Audio output power: 10mW 19) Voice recording time: a) 64M: 135 minutes b) 128M: 270 minutes c) 256M: 540 minutes 20) Data transmission speed: Read 600Kb/s, Write: 400Kb/Specifications: 21) Working Voltage: 2.7V 22) Working current: 23-28mA 23) Sleeping current: <500uA 24) Frequency response: 20-20KHz Packing: gift box