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More Features 【BUILT-IN RECHARGEABLE LITHIUM BATTERY】 - The built-in lithium battery make the standby time up to 10 hours and MICRO USB interface is very convenient to charge. 【REAL-TIME MONITORING】 - With the real-time monitoring function, you can test whether it is working normally during recording. 【TRANSMITTER POWER MONITOR】 - You can prepare in advance when there is no electricity; and dynamic display bar can effectively test the working status. 【ADJUSTABLE RF SIGNAL STRENGTH】 - Working distance < 60 meters,switch to low strength mode to reduce power consumption for longer standby time; when working distance is long,switch to high strength mode to improve the audio recording quality. Specifications Transmitter TX Channels:96 Group A Wireless Frequency:520.000MHz ~ 548.500MHz Group B Wireless Frequency:550.000MHz ~ 578.500MHz Signal / Noise:>65dB Antenna:1/4 Wavelength Wire Antenna Transmitting Power:10dbm/15dbm Stray Radiation:-60dBc Sound Delay: