Features:

The Rockville RWM1202VH is a wireless microphone system that consists of two handheld microphones and a mic receiver that operates on the VHF frequency range.
Capsule for a high-performance, cordless, portable microphone, upgraded
Comprises transmitter and a pair of wireless cardioid microphones with high sensitivity and omnidirectional pickup.
Using a two-stage filtering system to reduce unwanted echo and interference
Extraordinary signal steadiness prevents distortion.
The transmitter and receiver form an automated link for convenience.
Take advantage of dual handheld microphones.
Each mic has its own volume knob.
Durable metal enclosure
Composite microphone with an ergonomic design
Reduced battery drain means longer run times.

Specifications:

System:

Operating Range: 100'-200'(indoor), 65'-165'(outdoor)
Channel: Two Channel
Frequency Range: 170MHz - 260MHz
Frequency Response: 80MHz-12000MHz
Frequency Width: 32Mhz
Dynamic Range: 110dB
Operating Temp: 14°F ? 122°F
Oscillation Mode: Quartz Crystal
Frequency Stability: ±0.005%
Modulation Mode: VHF
Frequency Response: 80Hz ? 8 KHz (±3 dB)
Harmonic Radiation : S/N: 60dB
RF Output Power: 10mW
Power Voltage: AC110V/ 220V - 50/60Hz
Mic Battery: 9V

Receiver:

Sensitivity: (S/N=30dB) >2mV
De-Emphasis: 50µS
Audio Output Impedance: 600O
Audio Output Level.: 0-0.5V
Power Supply: AC110V /220V 50/60Hz
Current Consumption: =50mA
Audio Out Connector: 1/4" unbalanced 
Transmitter:
Frequency Stability: ±0.005%
RF Output Power: =30mW
Modulation Mode: VHF
Maximum Deviation Range: ±50KHz
Microphone Mode: Fixed
Pre-Emphasis: 50µS
Power Supply: AA/1.5V×2
Current Consumption: =35mA

Includes:

2 wireless handheld microphones
1 receiver unit
User manual
Batteries
Power adapter