PMM-3738-VM1010-R Low Noise MEMS Microphone PUI Audio PMM-3738-VM1010-R is a low noise, single-ended analog piezoelectric MEMS microphone with Wake-on-Sound. PUI Audio PMM-3738-VM1010-R with Vesper technology is a ZeroPower Listening™ piezoelectric MEMS microphone. This PMM-3738-VM1010-R microphone is designed for ultra-low power always listening solution delivering voice activation to battery-powered devices. Features include full audio output on wake-up, dust and moisture resistance, and extended battery life up to 10x.