The Adastra DM40 is a 100V line mixer-amplifier featuring a compact design and a digital amplifier. It includes an onboard audio player that supports USB media for digital audio playback and can also tune into FM radio stations. In Bluetooth mode, you can pair a smartphone or tablet for wireless audio streaming. The amplifier offers a mono output compatible with either 100V line or 4-16 Ohms speaker loads, connected via spring terminals. This all-in-one unit is ideal for small-scale sound installations. It includes controls for treble, bass, MP3, Aux, and Mic. The USB port is for media playback only and does not support smartphone charging.