HIFI-R judge in-ear headphones for V4C V4CPLUS FBIM judge intercom headset Buyer please note: bluetooth module intercom headset is not included!!!Feature: Plug type: 3.5mm Place of origin: China (Mainland) Suitable: for FBIM intercom Special properties 1: for football referee and coach arbitration Special features 2: mono headset earphone guides Special features 3: football referee intercom headset Special features 4: football referee intercom headset This headset is specially designed for football and handball referees. Referees wear the headset single-ear headset to get real-time game information, this headset supports them freely, but also hears clear sound even when the environment is noisy. The headset works with EJEAS intercom, FBIM are recommended, To work with headset - so you can group a team of four to talk in real time (V6 needs to switch one by one). Referee Earphones, Simple and lightweight 3.5 interface, widely used in soccer referees. Get one if you happen to be a soccer lover or for motorcycle fans! By the way, only judge headset is included, not including intercom. Kindly reminder: 1. This earphone can work for intercom FBIM V4C V4CPLUS2. Intercom not included, only headphone and microphone, if you need intercom,