... 1.With build-in memory flash and USB port 2.MP3 player module, sound ic module, USB voice module, audio module , custom ... under key control mode.*Download the sound files by Mini USB with our PC software (free)*Operating voltage: DC5V.* ... Alarm,Medical Devices3. Household Appliance( Induction Cooker,RiceCooker,microwave oven)4. entertainment facilities(Gaming Console)5. Learning Model (Early Learning ...