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This is the Whelen OMNI-ALERT™ D2030NV/OD230NV WPS2900 Series One-Way Control. It is a One-Way 10-Digit DTMF Narrow Band VHF 138-174 MHz Radio Option that works with the OMNI-ALERT™ Siren package found here.
Note: Customer must supply siren RX Frequency with the order. Please contact the e-Fire Sales Team for more info.