ST makes three digital microphones. The MP45DT02 is designed specifically for the notebook computer market. It has a top port, 3.76 x 4.72 footprint, 61dB SNR, and digital PDM output. The MP34DB01 is a bottom port microphone. It has a 3 x 4 x 1 package size, 62.6dB SNR, and again it has a digital PDM output. The MP34DT01 is a top-port microphone, same 3 x 4 x 1 package, 63dB SNR, and again digital output. The terms SNR and PDM will be defined on a later slide.