There are three primary types: Piezoelectric (Undersaddle), which offers high feedback resistance and a bright, percussive tone; Magnetic (Soundhole), which captures string vibration similarly to an electric guitar and is easy to install; and Microphone/Transducer systems, which provide the most natural, woody resonance but are prone to feedback. For professional B2B sourcing, dual-source systems (combining Piezo and Mic) are highly recommended as they offer the best balance of tonal authenticity and stage stability.