All Models Feature of ION Preamp Systems:
-Small footpint For easy access to controls
-Volume control
-EQ tone shaping control
-Phase control button
-Low battery indicator(powered by 9V battery)
-Separate surfac mount batter compartment for flexble design integation
-Pre-wire Fishman Sonicore pickup for solder-free,plug and play installation
-Low profile control knobsProduct Code: OEM-ION-301 
ION+  w/Sonicore pickup ,tuner ,bass & treble control ,and Combination battery box/output jack