1、Guitar Pickup: Provides outstanding sound and pickup range, can be installed in any standard acoustic guitar body. Equipped with tuning function. 2、5 Band EQ System: 5 band EQ equalizer adjusts frequencies with Push BASS, MIDD, TREB, PRES, BLEND. Includes volume control, power on off button. 3、Accurate Control: 5 band equalizer allows you to accurately determine the location and obtain the correct sound. Real loudness control function. 4、Easy Assembly: Pre wired, includes 5mm plug in cable. Battery compartment with built in 6F22 9V battery holder (battery not included in delivery). 5、Professional Tuning: Suitable for guitars and basses. Catches vibrations from guitar bridge through piezo strip pickup, driven by 9V power supply. 1 x EQ Pickup1 x Piezo Pickup Cable1 x Battery Case8 x Screws1 x Adhesive Plate1 x Cable Tie Item Type: Acoustic Guitar 5 Band EqualizerMaterial: Plastic, Electronic ComponentsBattery: 6F22 9V Battery x 1 (Battery not included)Frequency Response: 20Hz-20KHzControl Range: Bass: ±12dB at 60HzMiddle: ±12dB at 500HzMiddle 2: ±12dB at 1.2KHzTreble: ±12dB at 3KHzPresence: ±12dB at 8KHz Middle 2Control: 600Hz-2KHzTuning Notes: Chromatic, Guitar ModeTuning Modes: Chromatic and Guitar Tuning (7B, 6E, 5A, 4D, 3G, 2B, 1E)