RIAA Hi-Fi Preamplifier. You can connect your Pick-up to modern stereos that do not have a Phono input. You can also connect it to the PC to burn our own CDs, mp3. 
 Input - Output with gold-plated RCA plugs, it also has an input for grounding your turntable. 
 It can be placed vice versa so that you have the plugs in the back. 
Power supply 9 -24 VDC, also works with 9V battery.