The high power TX-300V transmitter from Phonak is the ideal transmitter to cover large areas such as auditoriums, lecture rooms, houses of worship, town halls, movie theaters, theaters, universities, sports venues,shopping malls, railway stations or other public places. The TX-300V is compatible with all Phonak FM receivers, the global standard for personal wireless communication for hearing impaired people.The 9.5" transmitter TX-300V from Phonak is the ideal transmitter for the world's first (and only!) in-ear RF receiver: invisity. The TX-300V covers the entire frequency range from 150-220 MHz. Twenty frequencies are freely programmable along with the transmission strength and channel names. Individual inputs as well as Automatic Gain Control are supported.