Features:This product is made of high-quality materials, which is durable and has good effect. It is suitable for various occasions where the acoustic guitar is required to be placed outside the sound.There is a bridge piezo transducer pickup input and C-Mic input, which can highly restores the sound of the guitar resonance in the resonance box.There is a PHASE button that will put the pickup "out of phase" with the speaker.Powered by a 9V alkaline battery (not included), the replacement battery can be used for over 1000 hours.C-Mic can receive the sound of tapping the guitar panel. With it, you can tap the rhythm with a guitar.Specification:Color: BlackMaterial: Metal, PlasticInput Impedance: 22 MegaOhmsFrequency Response: 20Hz ~ 20KHzPower Supply: DC 9V, Alkaline Battery (Not Included)Battery Life: Over 1000 HoursPickup: Omega-II (Piezo Cable Pickup)Output Jack: 6.35mm (1/4")Dimension of the Preamp: Approx. 7.2cm x 5cm x 2cm (Approx. 2.8" x 2.0" x 0.8")Weight: Approx. 91gPackage List:1 x Preamp Box1 x Piezo Cable Pickup1 x Battery Case1 x Battery Cable1 x Paste Sheet2 x Cable Clip1 x User Manual