DMM Omni-Directional Microphones PUI Audio DMM Omni-Directional Microphones are digital MEMS microphones with PDM/I2S output. These microphones feature ±1dB tightly controlled sensitivity and a wide frequency response. PUI Audio DMM microphones are available in four variants such as the DMM-3526-B-R, DMM-4026-B-I2S-R, DMM-4026-B-R, and DMM-4326-T-R. The DMM-3526-B-R, DMM-4026-B-I2S-R, and DMM-4326-T-R feature a top acoustic port, while the DMM-4026-B-R comes with a bottom acoustic port. These microphones are designed for cloud-based applications and battery-powered designs. Each microphone can be configured for the left or right channel, ideal for stereo applications. These microphones are IP57-rated with waterproof mesh pre-applied.