This is HiFiBerry DAC+ with a pair of RCA jacks. It can be simply plugged onto your Raspberry Pi Model A+,B+ or 2B, it does not need any soldering.
The DAC+ Light is based on an ESS Sabre chip set that does not have ALSA volume control. To control the volume, you need to use an application with software volume control or a a (pre-)amplifier with volume control.
Note that this model is not compatible with older Raspberry Pi model A and B units!