New for 2019 . BrownBox FTF .Full time Filter upgrade . we've added an integrated EMI/RFI noise filtering circuit . Note if you own an earlier version BrownBox unit we can modify it to accept the new Filter Module . to take advantage of this update Mod, the fee for parts and labor is a discounted $25.00 . directions , ( carefully pack ) your BB unit and include a prepaid return label inside the box. it is strongly advised that the shipment be insured for the full replacement value.