Unlike typical undersaddle acoustic guitar pickups that are dependent on string compression for their sound, the Element Active System™ was engineered to mirror the soundboard’s actual movement as you play. At the heart of the pickup, a flexible film sensor only 2 thousands of an inch thick picks up the guitar’s most delicate nuances. Tracking the motion of the top rather than a direct string attack suppresses “quack” caused by compression and unlocks the Element’s unrivaled dynamic range. The pickup’s minimalist construction lessens any influence on the acoustic properties and creates an intimate coupling between the pickup and guitar for the highest fidelity possible.The EAS-VTC builds on the strengths of the EAS with the addition of a treble tone control and a special low frequency compression circuit. The LF compressor tames low end thump and mimics the actual dynamic response of the guitar for enhanced realism.LR Baggs EAS-VTC Features:All-discrete endpin preampPre-attached Element pickupFits both 3/32” and 1/8” saddle slotsBuilt-in LF compressorSoundhole mounted volume and tone controlLR Baggs EAS-VTC Specifications:Battery type: Single 9VBattery life: 1,000 hrs LR Baggs EAS-VTC Element Active System VTC Acoustic Guitar Pickup with Volume & Tone Controls.