The NB-3002D is a car power amplifier manufactured by UNI-PEX. It has two built-in power amplifiers and allows you to switch between front and rear speakers.
The NDS-202A is a UNI-PEX in-car amplifier with an SD recorder. It can be easily installed in-dash or under the dashboard. In addition to SD playback, it can also mix with one microphone input and one AUX input. It supports recording and playback in MP3 format.