This is the bare board of a stereo diamond buffer. Diamond buffer is well-proven structure in audio application with the strength of wide bandwidth and strong driving capability. The buffer board can be used as a building block in the audio path, such as a buffer in between the digital audio source and the preamplifier, or even as a preamplifier( gain of 1) by adding a potentiometer at the front. For the connection and schematic of the board please see below. PCB dimension: 60mm x 43mm. The board requires a +/-15V DC power supply. Current consumption would be decided by the loading. We do air shipping worldwide at US$4.00. We welcome combine shipping. On Mar-05-09 at 01:27:39 PST, seller added the following information: Sellers: Get your own map today. Click here now. Simple." On Apr-06-11 at 21:12:00 PDT, seller added the following information: SquareTrade AP6.0 SquareTrade squaretrade warranty v2.0