Schertler Dual System for Steelstring Guitar, two part pickup system (one part to be fitted under the bridge and the second part to be fitted under the topside of the body), LYDIA bridge-pickup and the electrodynamic D-DYN pickup, active A-CLASS pre-amplifier, volume pot and the mix pot for the balance of both pickups should be build into the soundhole, width of under-bridge pickup: 2,3 mm, length 70 mm, pickup is situated in the middle of the transducer, 3-V-lithium batteries inc, should be fitted by a professional luthier