Mechanical Specifications6mm indicator hole, 15mm switch hole (verify with calipers) 0.11 kg lightweight for embedded installation ^^ Core Features 4 stereo inputs (AUX/PHONO/DVD/CD), button-switchable OD @ WOUT Independent LED indicators per channel ^^ Electrical Parameters AC 6-12V or Dc 9-15V power input Stereo L/R output, THD <0.1%@1kHz ^^ Control & Wiring Tactile buttons (100,000+ cycles)40cm band switch/30cm e-switch wires (shielded) ^^ Installation Tips Deburr holes; drill switch hole in two steps(14-15mm)Maintain > 5mm clearance for heat dissipation