This unit has the PSN-SERIAL V3 16-bit serial output A/D board, the PSN-ADC-EQUAMP 4-channel amp/filter board; all in the nice metal = enclosure. Wall power supply and valid WinSDR v 4.1.9 license included. The = amp/filter board has 12Hz LP and 60 sec HP filter. Input impedance 10k. Gain set = to 200. New cost including shipping and handling was $423.00 and was = purchased on 6/18/2008. In like new condition for $323.00 to anywhere in USA. = Paypal only. Contact off list at ks4ns@.......... Dale Hardin =20 =20This unit has the PSN-SERIAL V3 16-bit serial output = A/D board, the PSN-ADC-EQUAMP 4-channel = amp/filter board; all in the nice metal enclosure. Wall power supply and valid = WinSDR v 4.1.9 license included. The amp/filter board has 12Hz LP and 60 = sec HP filter. Input impedance 10k. Gain set to 200. New cost including shipping and handling was $423.00 and was purchased on = 6/18/2008. In like new condition for $323.00 to anywhere in USA. Paypal only. Contact off list at ks4ns@.......... Dale Hardin