Features: The Pure Classic is passive system for classic guitar, with four pickup heads and an endpin jack. It is a transducer systems only and does not include a battery or on-board electronics. Don't be fooled by the sound of some competitors' ""thin sounding"" passive systems--the Pure Systems are definitely different. They sound full and rich and have sufficient output to drive most amps and PA systems directly! Installing the Pure Classic The Pure Classic is designed to be installed with superglue for optimum sound transmission. For the players who do not wish to do this we also supply a special extra thin double stick tape for peel-and-stick removable installation. Pickups mounted with this tape require a preamp. The peel-and-stick installation cuts off a little bit at both the low and high end plus the output is reduced by about 30% compared to the superglue installation.