Vectronics VHF intermod filter with BNC connectors, model VEC-813. Helps to eliminate out of band interference , and is an excellent choice for handie talkies, etc. Has 3 high-Q bandpass sections plus 2 low-pass L sections to form a razor sharp network for the 2 meter ham band. Attenuation of unwanted FM commercial out of band channels approaches -50 db. Switchable on/off on side, and RF sensing automatically switches the filter off-line, up to 50 watts. Filter is new, and includes box and manual. Powered by 9 volt battery. Buyer pays only actual shipping cost.