Knowles Knowles Digital Multimode MEMS Microphone Knowles Digital Multimode MEMS Microphone SPH0641LM4H1is a digital bottom port microphone with high Signal-to-Noise Ratio, multiple modes, and the lowest power consumption in the market. Ideal for consumer electronics, this new microphone enables voice controlled applications and maximizes battery life. The new microphone utilizes Knowles' low power 'Always On, Always Listening' technology to provide a high SNR component with the lowest power draw in the world - lower than the conventional analog microphone and analog-to-digital converter combination. It delivers up to 3x less power consumption than other digital microphones and is 20% smaller in size.