Fits in gauge opening. USB audio playback or charging. Compatible with KRC12 Remote Commander. RCA Outputs: 1 Set of Pre-amp Outputs. Line-Out Level: 2.5V. Outer Trim Ring Dimensions: 4.4. Mounting Depth: 3.9. Mounting Hole Diameter: 3. Mounting Panel Thickness Range: Any. AUX Input Sensitivity: 500 mV. USB Playback Formats: MP2, MP3, WMA, WAV16, FLAC16. Charging: DC 5V, 1 Amp.