Aguilar OBP-2SK Onboard Preamp Wire lead length: 6.50 inches, Low noise discrete FET input stage, center detent 50 K linear pots,with a dual concentric pot available. Bass control:+/-18dB bass at 40Hz Treble control:+/- 16dB treble at 6.5kHz Includes stacked Treble/Bass pot. Battery life: 324 hours,Wired up with one 9V battery, it will fit into just about any instrument