An internal microphone refers to a small device that is built inside a gadget or electronic equipment, like a computer or a smartphone. It is used to pick up sound or voices from within the device itself. Full definition
It packs dual noise - canceling internal microphones that can record audio from up to 23 feet away and record from any direction. (digitaltrends.com)
It has dual internal microphones with ASUS noise reduction technology as well. (techandroids.com)
Among the other enticing features the Hanvon Touchpad BC10C comes with include dual internal microphone along with speakers, port for attaching a MIC and speaker, 5 + 3 shortcut buttons, SD Card slot, Mini HDMI out, VGA out dongle, webcam 2 x USB and so on. (goodereader.com)