The M1 Active™ is for players who love big acoustic tone with high feedback resistance on any stage. Combining the natural characteristics of your guitar’s soundboard with a punchy string attack, the M1’s body-sensitive design provides enhanced realism while cutting through a loud mix.Body-Sensitive Design: The M1 is a patented humbucking pickup with a twist. In a common stacked humbucker, the lower coil cancels hum, but doesn’t contribute anything positive to the sound. They unlock the lower coil with a carefully tuned support that allows it to capture higher frequency resonances. As the pickup moves with the guitar’s soundboard, a body signal is created in the suspended coil that adds presence and realism to your amplified sound.LR Baggs M1A Features:Highly Feedback-resistantVolume controlBuilt-in gold plated 1/8" jack makes removing the pickup a snapLong battery life – 1,000 hours on one 3V lithium coin cellAdjustable pole pieces for perfect balance with most string types and gaugesIncludes a pre-wired strap jack harness LR Baggs M1A ctive Active Magnetic Soundhole Pickup.