Features - Color: Black. - Material: Plastic. - Size: 9.15x3.4x1.3cm - High volume speaker, supports multiple music formats. - Built-in a large LCD display screen, allows you to see its occupational status clearly, convenient for you to operate. - Suitable for meetings, lectures, conversations, classroom, presentations, students learning and other occasions. Specification - CPU model: ATJ2127 - CPU frequency: 24KHZ - Music playback formats: MP3, WMA, OGG, APE, FLAC, WAV, aac-lc, ACELP, etc - WAV format (512kbps.1536kbps),MP3 format (64kbps.192kbps) sampling frequency - Headphone jack: 3.5mm stereo port. - Maximum output of headset :(L) 9mW+(R) 9mW (32Ohm) - USB interface: 3.5mm interface/dc5v-1000mah (special for this machine) - Screen: 0.8 inch duplicate LED, resolution 128*64 - Built-in MIC: non-directional capacitor MIC - Recording current: 8ma-13ma - Frequency: 24 hz - Distortion: 90dB - Signal-to-noise ratio: 0.06% - Built-in speakers: Dynamic 2510mm,8ohm - Built-in speaker output: 800mW - Storage: embedded flash (4gb-32gb optional), external TF extension 4gb-128gb - Operating temperature: -10 ~ 40 - Body weight: 44.6g (bare) - Fuselage Size: 91.5mm34mm13mm - Power supply: lithium battery / 3.2-4.2v - Battery: lithium ion (LiCoO2) : 200MAh - Power supply time: about 20 hours of recording. Play for about 10 hours (with headphones) - Support system: Windows XP&Vista/2K/ME/98(drivers required) /Mac OS 10