Numark Micro Stereo Booster Amplifier
This "Micro Stereo Hi-Fi System" was made in Japan for Numark Electronics Corp (Edison NJ). Probably during the early or mid 1980s. The model number is BA-2200, but in the instruction manual it says XL100. It's a small portable amplifier and a pair of speakers, totalling 13.75 inches long altogether. It was intended to be connected to a Walkman or other line source. You can power it with 6 D-cell batteries, or a 9V 800mA adaptor. It has a nice, all-metal case with a brushed aluminum front. It also has a black vinyl case to hold everything. The amplifier consists of two Rohm BA514 chips, each protected by a 0.75 amp fuse.