Federal Signal 210335SSG Evacuator Back-Up Alarm, Dual Tone Universal Mounting Bracket, 112 dB(A) Multi-voltage, 12-48 VDC, with maximum current draw of 0.15 Amp Solid-state electronics and a sealed design protect against moisture contaminants and vibration Nickel-plated threaded terminals Approval SAE J994 Type A, OSHA and MSHA