Wheelock MT4-24-LSM Category : Wheelock This is an earlier version of the MT. I do have two of these. Brand WheelockModel MT4-24-LSMManufacturer WheelockType Alarm (Horn/Strobe)
Wheelock EH-EL1 Category : WheelockThis horn was attached to my Space Age Electronics A32-BL-SFXC-TJ24B-0000 when I received it.
Edwards 276B-1320 Category : EST/EdwardsThis is essentially the single-action, non-addressable version of the EST SIGA-278.
EST SIGA-278 Category : EST/EdwardsThis unit is rusting ever so slightly. It features a newer EST logo on it.
