There are several models talking buttons,each model has different size and appearance.
We can divided them into three groups based on the function:
Sound version: Customer need provide mp3 or wave sound file to us,engineer will program based on the requested playing mode and sound time,when press the top voice record button,the talking button will play sound soon.
Record version: There is no sound in recordable talking button,customer can record their own voice or sound by the voice box button,then play it.
USB version: This kind sound button also no sound inside,customer can upload or delete mp3 format sound files from PC to sound button by USB cable,so can change sound files always.