VT-4, a versatile voice transformer with a variety of effects. - Brand: Roland - Model Name: VT-4 - Accessories: Instruction manual - Function: Voice transformer - Color: Black The instruction manual has some stains, but is perfectly readable. Also, the Key knob is broken and cannot be turned counterclockwise, but it can be used without any problems if turned clockwise. ・Connections: MIC IN jack (rear): Combo type (XLR, TRS standard), balanced (phantom power DC 48V, 10mA Max.) MIC IN jack (front): Stereo mini type (plug-in power) PHONES jack: Stereo mini type LINE OUT jack (L/MONO, R/BYPASS): Standard type USB port: USB Type B MIDI IN jack ・USB: Audio, MIDI ・Power: Rechargeable nickel-metal hydride batteries (AA) x 4 Alkaline batteries (AA) x 4 Obtained from USB port (USB bus power) Dimensions: 174 (W) x 133 (D) x 58 (H) mm The battery cover is missing, but it doesn't fall off, so it can be used without any problems.