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Website
https://www.rockvilleaudio.com/rwm90u/
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https://www.audiosavings.com/rockville-rwm90u-quad-uhf-handheld-wireless-microphone-system-w-lcd-metal-casing
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https://www.amazon.com/dp/B07MNVZXNW?th=1&psc=1
What's in the Box:
4 wireless handheld microphones
1 receiver unit
User manual
Batteries
Power adapter
Features:
Rockville RWM90U UHF Quad Wireless Microphone
High performance wireless handheld microphone system
Includes transmitter with four high sensitivity, unidirectional, wireless, handheld cardioid microphones
Color coded microphones
Featuring a dual filter design to limit feedback and interference
Ultra signal stability eliminates unwanted distortion
Professional receiver with multifunction color displays shows frequency, signal synch, and audio input
Transmitter automatically links to receiver for ease of use
Individual microphone volume controls
Receiver has a rugged metal housing
Comfortable ergonomic composite microphone construction
Low power consumption for longer battery life
System:
Operating Range: 300´ – 400´(indoor), 250´ – 350´(outdoor)
Channel: Four Channel
Frequency Range: 467MHz – 490MHz
Frequency Stability: ±0.005%
Modulation Mode: UHF
Frequency Response: 50Hz – 15KHz (±3 dB)
Dynamic Range: 105dB
S/N: 100dB
T.H.D: < 0.5% (1KHz)
Audio Output Jack: XLR balanced & 1/4" mixed
Power Voltage: AC110V/ 220V – 50/60Hz
110V/220V Volt Switchable
Operating Temperature: 3°F – 130°F
Mic Battery Operating Time: up to 10 hours
Oscillation mode: Quartz Crystal
RF Output Power: 10mW
Output Level: 0 – 300mV