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2 are a different version that features a heat-sink - The other 2 do not have heat-sinks - These modules are for operating Miller Engineering signs off track voltage or from your power pack. Accepts an input voltage from 5 to 17 volts, AC or DC, and outputs the required 4.5 volts for the signs. Each converter module can run up to 6 signs - Signs are sold separately

• Cosmetic Condition: C-7 Excellent
• Voltage: 4.5 V DC Output
• Packaging: Original Box
• Paperwork: Instruction Sheets Included