Unlike typical undersaddle acoustic guitar pickups that are dependent on string compression for their sound, the Element 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 patented one-size-fits-all Element reproduces impressive body sensitivity and articulation. It also has the greatest dynamic range of any undersaddle pickup available. The Element Active System features an all-discrete Class A endpin preamp and a soundhole-mounted volume control for easy access. Also included is a battery bag for secure battery retention.LR Baggs EAS Features:All-discrete endpin preampPre-attached Element pickupFits both 3/32” and 1/8” saddle slotsSoundhole mounted volume controlLR Baggs EAS Specifications:Battery type: Single 9VBattery life: 1,000 hrs LR Baggs EAS Element Active System Acoustic Guitar Pickup with Volume Control.