Using audio pattern-matching algorithm, BelaSigna R281 can detect single, user-trained trigger phrase, which can be any series of sounds, and is neither speech nor language dependent. Upon recognizing trigger phrase, BelaSigna R281 will assert wake-up signal which, when connected to host controller, alleviates need for users to touch device to wake it prior to use. SoC has virtually no impact on standby battery life and works with both analog and digital microphone signals.