Feature:1. Can adjust the phase angle and gain to eliminate unwanted signals before they get to the front end of the receiver.2. The builtin PTT control can maintain the stable and efficient connection status of the silencer during transmission.3. You can insert the QRM signal canceller into the feeder without any additional modification to the radio, very easy.4. Comes with dial and knob pointer, the QRM signal silencer allows for simple adjustment by rotating the the knob.5. The aluminium alloy shell is very sturdy and wearresistant, which also has great durability for a long service life.Specification:Item Type: QRM EliminatorMaterial: Aluminium AlloyFunction: EliminatorColour: BlackFrequency Band: 1-30MHz HF.Package List:1 x QRM Eliminator1 x Power Control LineNote:There is a deviation of 0.51 mm between the dial and the knob pointer. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.