The MINKEZ's MA-120V is a lightweight mini constant voltage digital power amplifier that suitable for background music playback in small and medium-sized supermarkets, shopping mall and leisure cafes. This public address system supports MP3 / tuner / bluetooth remote control function, with a control distance of up to 8 metres when using the remote. It also has a USB and SD card interface, as well as an integrated MP3 player module with automatic priority playing audio and a digital screen that can display the current USB track being played. It contains 1 EMC input channel, 2 AUX input channels, and 4 MIC input channels. Even better, each input has its own volume control, and the total volume may be adjusted for treble and bass with the volume control function.