These were recently removed from a working environment. Very lightly used and in excellent condition. 
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Product Information
OverviewThe RLC3 is designed to directly interface with RDL control modules which feature a 0 to 10 Vdc control input utilizing an external 10 kΩ resistive control, such as the ST-VCA3, RU-VCA2 and RU-VCA2D voltage controlled amplifiers. The RLC3 has four momentary pushbuttons, each corresponding to one of four levels selected.

In a typical installation, the RLC3 is wired to an RDL VCA. The RLC3 runs from the same power supply as theVCA. When power is applied, the RLC3 defaults to the NORM level. One higher level, HIGH, and two lower levels, LOW and MIN, are then available for selection. When the RLC3 is set to the HIGH position, the VCA is at maximum gain. The NORM, LOW, and MIN levels are each adjustable by the installer using trimpots on each side of the RLC3's body. Once installed, the adjustments are concealed from the user.
Features
  • Remote Selection of Preset Audio Levels
  • Pushbutton Level Selection
  • 4 Selectable System Levels, or 3 Levels Plus Off
  • LED Indication (Green)
  • Premium-Quality Remote Panel
  • Professional Aesthetic Appearance
Specifications
  • Interface: Direct connection with RDL modules using 0 to 10 Vdc, 10 kΩ resistive control (see ST-VCA3, RU-VCA2)
  • Output: Selectable resistance (CTRL Terminal ) to ground in 4 steps:
  • RLC3 OUTPUT ST-VCA3 GAIN
  • High: 10 kOhm, 0 dB
  • Norm: Adjustable, -3 dB to -30 dB
  • Low: Adjustable, -5 dB to -40 dB
  • Min: Adjustable, -10 dB to Off
  • Mounting: Mounts in US electrical box or RDL international wall boxes WB-1U, WB-2U; decorative plate available separately.
  • Power Requirement: Ground-referenced, 24 Vdc @ 30 mA
  • Ambient Operating Environment: 0 C to 50 C