Feature: 1. The QRM canceller allows adjustment of the phase angle and gain to cancel unwanted signals before they arrive at the front end of the receiver. 2. Built-in PTT control, the built-in PTT control can keep the connection status of the canceller during the transmission. 3. Very convenient, the QRM eliminator is inserted into the feedline without any additional modifications required to the radio. 4. With dial and knob pointer, the eliminator has a dial and a knob pointer, and the phase can be adjusted through the knob. 5. Made of high quality aluminum alloy shell design, strong and wear‑resistant, can provide a long service life, with excellent performance. Specification: Item Type: QRM Eliminator Material: Aluminum Alloy Color: As shown in the picture Application: Radio signal reception Power Supply: 13.8V-RED GND-BLACK PTT-WHITE Range: Phase: 0-10 Gain2: 0-10 Gain1: 0-10. Package List: 1 x QRM Eliminator1 x Power Control Line1 x Instruction Manual Note: There is a 0.5‑1mm deviation between the dial and the knob pointer.