1、Aluminum Shell: The eliminator adopts aluminum shell, and the front and rear baffles are epoxy glass fiber board FR4, which is durable. 2、PTT Control: The box has a built in PTT control, which can maintain the connection of the canceller during transmission. 3、Easy to Use: The QRM canceller is inserted into the feeder of the antenna without any other modifications to the radio. 4、Knob Adjust Phase: A silencer with a dial and knob pointer, you can adjust the phase through the knob. 5、Complete Innovation: Based on the concept of complete innovation, the canceller is incomparable to the performance of ordinary "silencers". SpecificationItem Type: QRM EliminatorShell Material: AluminumFront and Rear Baffles Material: Epoxy Glass Fiber Board FR4Colour: BlackFrequency Range: 1.8 MHz-30 MHzSize: Approx. 120 x 95 x 45mm / 4.7 x 3.7 x 1.8inConnection: 3xBNC is used for main antenna, auxiliary antenna.RCA Jack for PTTPower Interface Size: Approx. 5.5 x 2.1 mm / 0.2 x 0.1in Power SupplyPower