... land Exquisite and useful 2.4G intercom with high quality in 2011 TA-502 TWO WAY intercom Technique ... building site, etc.. real-time communication.2,Repair site real-time communication.3,Secure communication, digital wireless FM Duplex intercom4 ... reading5,Remote control of safety and production6,Communication in construction fields7,Communication for race in open land8,Traning for football, race ...