The patented design of the Martin Thinline Goldplus Acoustic Pickup System solved the age-old problems of string balance, string spacing and wire-hole placement, making it applicable to all guitars. Martin uses a highly sensitive copolymer specifically formulated for guitars for the Thinline's pickup material. The short distance from the undersaddle pickup to its internally mounted preamp maintains the information-loaded signal's integrity. The preamp is designed for guitars that are amplified at high volumes, especially full-size guitars. The Martin Thinline Pickup is voiced to control boominess and to provide extra brightness. Recommended for musicians in situations where the guitar needs to stand out and sound natural without feeding back. The circuitry on the Martin Thinline Goldplus Pickup's preamp allows a battery life of 12,000 hours.