Features: With this preamp, you spend less time tweaking controls and more playing. Offer great tone and pickup range, and is made to be installed in the body of most standard Guitar. Instead of just an switch,the tone shaper features an actual loud contours control so that you can precisely determine the levels of the contours and get the right sound. A phase switch provides additional feedback control by allowing the phase of the pickup to be reversed in relation to the phase of the amplification speakers. 5-band tone controls. Suitable for most guitarists looking to improve their sound. Specifications: Materials: Metal and plastic Size: about 9.8x5.8x4.0cm/3.86x2.28x1.57inch Package Includes: 1set Guitar Preamp Amplifier note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.