R7BT-USB
Ultra thin design, supports USB/USB flash disk (MP3) playing, built-in Bluetooth 4.0 receiving and playing (controllable), supports USB (USB flash disk) recording, supports color LED nixie tube display MP3 working status, external wide voltage high-frequency power adapter (DC power adapter), 12V safe voltage. 2/5-channel mono, 1 group of stereo, channel three segment equalization, one group of auxiliary transmission, one group of effect transmission and return, built-in digital effector, 60mm stroke precision sliding potentiometer. 3-color special 5-column LED level indicator.
