Wavtech ART Auto Remote Trigger / 12 Volt Generator. 

The ART is the ultimate time saver. In some vehicles it can be difficult, or downright impossible to find a switched +12V source. In these instances, the ART is the solution. It provides an easy way to generate a +12V trigger for audio systems or small electronic devices, such as dash cams or radar detectors. Installation is simple. All that is required is a +12V for Power, a Chassis Ground and connection to a single speaker. That’s it.

Features:

• +12V Output Generation
• Capable of Driving Multiple Relays Simultaneously
• 1.5A Continuous Output Current
• Independently Select DC Offset or Audio Detect, or Use Both Simultaneously
• Locking Detachable Terminals
• Compact Size
• Dimensions: 0.7" x 1.7" x 1.4" (18mm x 44mm x 36mm)