The HiFiBerry DAC+ standard is a high-resolution digital-to-analog converter for the Raspberry Pi (newer models with 40 pin GPIO connector). This is a special sound card for the Raspberry Pi, optimized for one specific use case: the best audio playback quality.Usage recommendations small and elegant high quality music playback devices home automation and multi-room audio systemFeatures Dedicated 192kHz/24bit high-quality Burr-Brown DAC with external low-jitter clock for best sound quality. Hardware volume control. You can control the output volume using “alsamixer” or any application that supports ALSA mixer controls. Connects directly to the Raspberry Pi, no additional cables needed No soldering, comes as a pre-fabricated kit. You just plug it onto the Raspberry Pi, it is conform to the Raspberry Pi hardware-attached-on-top (HAT) specification. Compatible with Raspberry Pi models A+, B+ and 2B (Zero when soldering GPIO header) Directly powered from the Raspberry Pi, no additional power supply Ultra-low-noise voltage regulator for optimal audio performance Comes with all components required to mount it. We include 4 M2.5x12mm spacers to fix the board onto the Raspberry Pi.Part List 1 x HiFiBerry DAC+ standard RCA audio board 4 x M2.5x12mm spacers to mount on the Raspberry Pi For any technical support, please contact our user guides and forum: http://support.hifiberry.com/hc/en-us/