1This microphone can be used for the W4RT One Big Punch OBP modification. 2Stock/replacement hand microphone for FT-817/FT-900/FT-450D modular RJ-45 connector. 3Simple installation, no need complicated tools, convenient for using. 4Made of high quality ABS for maximum durability, which has long service life. 5Stable characteristics, professional performance, high reliability.Condition: 100% Brand New Item Type: Radio Handheld Microphone Material: ABS Color: As picture shown Fitment: Fit for Yaesu FT-817/FT-900/FT-450DOperation: 1. When the walkie-talkie is launching, keep the walkie-talkie in a vertical position and keep the microphone 2.5-5cm away from the mouth. When launching, the intercom is at least 2.5cm away from the head or body. If the handheld radio is carried on the body, the antenna is at least 2.5cm away from the human body when transmitting. 2. Do not perform multiple power-on and power-off actions during use, and adjust the volume to a volume suitable for your hearing. }1 x Hand Mic These factors and other parameters directly affect the field strength and coverage of the signal. Environmental factors mainly include paths, density of trees, electromagnetic interference of the environment, buildings, weather conditions and terrain differences.