Check the listing for details. HP 3321-60027 4 GHz, 0-70 dB, 5 VDC, SMA, Programmable Step Attenuator. Tested!. Condition: Used. Listed at 47.99 USD. Programmable Attenuator. SMA (F-F), 5 VDC. DC to 4 GHz, 70 dB.