Product parameters :Recording format: wav formatRecording power: 0.8ma-12maRecording sampling rate: 8kHz / 16KHz / 48KhzRecording bit speed: wav (32 / 128 / 192 / 384kbps)Music playing format: MP3, wavHeadphone connector: 3.5pie stereo jackMaximum headphone output: (L) 9mw + (R) 9mw (32ohm)USB interface: micro-5p / dc5v-300mahStorage: embedded flash memoryBuilt in speaker output: 800MWBuilt in Speaker: 8R / 0.5W, diameter 26Built in mic: omnidirectional capacitor micDisplay: 1.0 inchesDistortion: 90dBSNR: 0.06%Operating temperature: - 10 ~ 40 Body weight: 32.5g (bare metal)Body size: 85mm 36mm 14mmPower supply mode: lithium battery / 3.2-4.2vBattery composition: lithium ionBattery type: LiCoO2Battery capacity: 220mahBattery weight (g): 4GWatt hours per battery: 0.81whLithium content: 0.066gBattery size: 3.5mm * 14mm * 55mmBattery life: recording for 18 hours and playing for 5 hours (plug in headphones)Supported systems: Windows XP & Vista / 2K / me / 98 (driver required) / Mac OS 10