https://www.tiggersound.com/webboard/index.php?topic=429223.msg4273751#msg4273751

Main Feature1.Digital UHF wireless microphone,Optional UHF band(500-980Mhz).
2.Unique ID pilot technology, no crosstalk disturbance even same frequency.
3.Frequency response:30-20KHz
4.Colorful TFT receiver display, LCD handheld display
5.Preset 180 frequencies for your selection .Auto frequency scanning and spectrum display.
6.Ideal distance: 40M
7.Suitable for KTV rooms, conference rooms, lecture and family entertainment.
RECEIVERCarrier Frequency UHF500-980MHz Distortion <0.1%
Bandwidth 30MHz Frequency Response: 30-20KHz/±2dB
Channel Bandwidth 300KHz Signal/Noise Ratio 96dB
Preset Group 30 group, 6 frequencies in each group. Receiving Sensitivity -95dBm
Dynamic Range 96dB Power Supply DC12V 1A
HANDHELDCarrier Frequency UHF500-980MHz Harmonic Radiation <-50dBc
Bandwidth 30MHz Battery 1x18500 Lithium battery
Frequency Switch IR SYNC Battery life >8h
The batteries are not included
Price : 4,900 Bath