... ,voice module,sound moduleFeatures * Support MP3 files, stereo with high quality sound* Support SD card, 1GB ... voice in SD card easily by PC.* Four kind of control mode :mp3 mode, key mode, parallel mode, serial mode * Dimension: 41mm ... areas (elevators, industrial equipment) MP3 modules, playback voice module, talk sound products, speaking,mp3 module,sound module,mp3, SD card voice player, sound ...