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Check the listing for details. 50M-18G 30DB Voltage Variable Attenuator Module Power Supply RF Attenuator Radio. Condition: New. Listed at 139.98 USD. Attenuate range: 0 - 30DB. - 1 x Attenuator Module. - Insertion loss: 1G - 2DB, 10G - 3DB, 18G - 4.5DB. - Input: Maximum 23dBm. Usually it costs about 30USD-50USD.