Amazon.com: NECAA 51654 Aliens 7,23353638055,Audible-visual Signal Beacon: 105 dB at 1m, green (PN# 23311806055) | AutomationDirect,Audible-visual Signal Beacon: 107 dB at 1m, green (PN# 23351156055) | AutomationDirect,Audible-visual Signal Beacon: 107 dB at 1m, red (PN# 23351155055) | AutomationDirect