specifications:
<br />1. all around
<br />carrier frequency: vhf 220~270mhz
<br />frequency stabilization: < 20ppm
<br />dynamic range: more than 0.5%
<br />frequency response: 40hz~18hz3db
<br />audio output level: -400mv~0~400mv
<br />mix out -200mv~0~200mv
<br />temperature range: -10  to 50 
<br />battery voltage: 1.5v batterynot included
<br />battery type: 1.5v batterynot included
<br />battery lifeh: 30 hours
<br />noises control: eliminating noises
<br />manipulate range: radio 200
<br />2. fixed receiver
<br />power supply: ac 220v/50hz
<br />consume power: 3w
<br />signal/nose ratio: >80db
<br />image & spurio rejection: >70db
<br />border upon channel rejection: >70db
<br />s/n: less than 12dbusind=20db
<br />de-emphasis: 50 
<br />
<br />package includes:
<br />2x microphones
<br />1x wireless receiver
<br />1x power adapter
<br />1x cable
<br />1x owner's manual