KM-U308-A High End Instrument Microphone

KM-U308-A High End Instrument Microphone
Instruments: saxophone, trumpet, tuba, trompone, tenor horn, french horn, etc.
Wireless UHF
Four channel signal optional 
True diversity 200 meters transmission
Natural, clear sound with with high sensitivy
Patent noise canceling
Battery charging 2 hours and can use for 6-8 hours
 
Specs
Frequency transmtion frquencies (4 channel) : 760, 770, 780 and 790KHz
Frequency range: 40Hz-16KHz
Frequency offset: +- 48KHz
Working influents: 110mA
Charging port: USB 5V/1A
Battery: Li-battery 3.7V/800mA
Using hours: 6-8 hours
Using distance: 30-40 meters
4 Channels