It is an calculator talking by the sound that you recorded.record ten sets. Calc play a sound at random.The reproduction volume depends on the media volume of the terminal.do not talk in the silent mode.The sound that you recorded is stored in "fTCalc" folder of the SD card.you can replace the sound that you recorded if connected to the PC.Do you make application pretty? or feel sick? It is up to recording.———————————-Ver 1.50 addition backscreen addition skinVer 1.30 copy to a clipboard. function addition. Animation of the button. function addition.Ver 1.20 supports TextToSpeech. (English)Ver 1.01 check Licence.