New & Improved! Taylor Guitars has Improved a Best Selling Guitar The Big Baby by adding on-board electronics. The Big Baby now has the Taylor Expression System Baby (ES-B) pickup (incorporating Taylor’s ES2 under-saddle piezo design elements) and an on-board preamp with a built-in digital chromatic tuner. The preamp/tuner unit features and LED display for tuning and low battery indication, along with Tome and Volume controls. Preamp/tuner is powered by two 3v lithium (CR2032) batteries.