The 4901 Series is a series of horns made by Simplex Time Recorder in the 1990's and 2000's. These horns were the first electro-mechanical (E-M) to use the Faraday no-contacts mechanism which results in longer life and no mechanical contacts. They also made electronic horns. the earlier electronic horns had a higher pitch and different sound than the current ones. in the late 90's, they changed the sound, and components of the electronic horns so they equal the sound of the truealerts. 4901 Models: 4901-9805: E-M horn, red, 24vdc 4901-9806: E-M horn, white, 24vdc 4901-9809: 3-Tone Electronic, red, 24vdc 4901-9810: 3-Tone Electronic, white, 24vdc 4901-9811: Electronic, red, 24vdc 4901-9812: Electronic, white, 24vdc 4901-9820: Electronic, sync/non, red, new grille 4901-9822: Electronic, Truealert, red, old grille 4901-9850: Truealert, addressable, red 4901-9853: Truealert, addressable, white 4903 Models: 4903-9001: Lamp, 24vdc, for 4904-9501 base 4903-9101: strobe, 24vdc, for 4904-9501 4903-9104: strobe, 24vdc, for 4904-9501 4903-9151: strobe, 120vac, for 4904-9501 4903-9154: strobe, 120vac, for 4904-9501 4903-9051: lamp, 120vac, for 4904-9501 4903-9152: lamp, 120vac, for 4904-9501 4903-9215: E-M horn, 30cd, red, horiz. mt. 4903-9216: E-M Horn, 30cd, red, vert. mt. 4903-9216: E-M horn, 110cd, red, horiz. mt 4903-9218: E-M horn, 110cd, red, vert. mt. 4903-9219: E-M Horn, 15cd, red, horiz mt. 4903-9220: E-M Horn, 15cd, red, vert. mt. 4903-9221: E-M Horn, 15cd, white, horiz. mt 4903-9222: E-M Horn,30cd, sync, white, horiz mt 4903-9223: E-M Horn,110cd, sync, white, horiz 4903-9401: E-M Horn,15cd, sync, red, horiz. mt 4903-9402: E-M Horn,15cd, sync, red, vert. mt 4903-9403: E-M Horn,30cd, sync, red, horiz. mt 4903-9404: E-M Horn,30cd, sync, red, vert. mt. 4903-9405: E-M Horn,110cd, sync, red, horiz mt 4903-9406: E-M Horn,110cd, sync, red, vert mt 4903-9413: E-M Horn,15cd, sync, white, horiz mt 4903-9414: E-M Horn,30cd, sync white, horiz. mt 4903-9415: E-M Horn,110cd, sync white, horiz 4903-9425: Truealert, 15cd, red, 4 wire 4903-9426: Truealert, 75cd, red, 4 wire 4903-9427: Truealert, 110cd, red, 4 wire 4903-9431: Truealert, 15cd, white, 4 wire 4903-9432: Truealert, 75cd, white, 4 wire 4903-9433: Truealert, 110cd, white, 4 wire 4903-9252: Truealert, 15cd, red, horizontal 4903-9253: Truealert, 30cd, red, horizontal 4903-9254: Truealert, 110cd, red, horizontal 4903-9257: Truealert, 15cd, white, horizontal 4903-9258: Truealert, 30cd, white, horizontal 4903-9255: Truealert, 15cd, red, vertical 4903-9256: Truealert, 110cd, red, vertical
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