Cherub GT-4 Acoustic Guitar Preamp 3 Band EQ Pickup for Folk Acoustic Guitar Cherub GT-4 Acoustic Guitar EQ pickup is a 3 Band EQ with volume control function , chromatic tuner , phase and middle frequency control. Small size, only 52*54*4 mm / 2.05*2.13*0.16 inch visible portion. Nice to fit your Guitar. High definition LED display module easy to read. Output Jack: 6.35mm, 1/4 inch. Powered by 9V Battery (Battery not included), indicator light shows if battery low. Package include a rod piezo pickup. Notes: This EQ pickup we used to supply to factories who install it to guitar directly. We sell here as some customer want to DIY their guitar pickup. We highly suggested before you purchase it you have already watched some installation videos and knows how to handle it. If you have any question before or after purchase, we are pleased to assist. Just click contact seller or ask questions at the page below.