Features: Enhances your wireless communication with our QRM Canceller X X Kit, expertly to effectively reduce interferences across the 130MHz frequency ranging, ensuring clearer and more stable connection. The QRM canceller plugs into the Antennae without any additional modifications to the radio; Withas a PTT control that keeps Canceller connection during transfer. However, additional auxiliary receiving Antennae is required, such as a 2meter antennae or a few meter of wire in shed;Two antennas receive unwanted signals, resulting in different phase; The QRM canceller allows adjusting the phase angle and amplification to remove unwanted signals before they reach the receiver front end It is on a completely innovative concept that cannot be compared with normal "muffler" performances. Specifications: Power 5.5x2.1mm Power supply: 13.8V/150mA Frequency ranging: 1.8MHz-30MHz Size: about 89mmx73mmx25mm/3.5x2.87x0.98in Package Includes: 1Set QRM Canceller X X Kit note: Due to problem of lighting,there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurement