Fishman Jon Gomm Powertap Earth Pro; Pickup & Pre-Amp for Acoustic Guitar; Construction: Rare Earth Mic Blend magnetic soundhole pickup with additional Tap Sensor; Pickup Mount: in the Soundhole & inside the Body; combines the easy installation and warm, transparent sound of the Rare Earth Humbucker & Mic with a totally new soundboard body sensor for a new world of percussive performance elements and tactile dynamics for guitarists of all styles; Pickup-mounted Mic Blend & Low Frequency Extension switch, Soundhole-mounted Tap Blend; Optional second output Jack for the Tap Sensor, This feature allows adding separate effects, level control, and EQ to each pickup independently; fits soundholes with a min. diameter of 92 mm (3,63"); Preamp: miniature preamp integrated in the pickup; Controls: Tap/Pickup Blend Control; Powered by: 2 x 1.5-Volt silver oxide oder 1 x 3-Volt Lithium Batteries; Pickup Dimensions (L x W): 64,5 x 17,3 mm; (2,54" x 0,68"); Included: 2 x LR44 1,5V Batteries