Q-See QSW8209 - Manual (Page 11)

Slide “Volume Switch” to adjust the volume of the receiver.
2. Channel selection
Press “CH button” to select the desired channel.
3. Channel Looping
Hold the “CH button” for three seconds to enter the loop mode. All the available
channels will be displayed one by one (default interval is 5 seconds).
4. Sleep Mode
Press the “Sleep Button” to shut down the LCD display and keep the voice
function. Press the button again and recall the normal working mode. This can
save energy.
5. Eliminate Alarm button
Press “Eliminate Alarm” button to stop alarm voice. Within 1 minute, the alarm
enters the next circle automatically.
5. Specifications
Item Value
GENERAL
Transmission Frequency ISM 2,400~2,483 MHz
Transmission Power 10mW/CE; 2mW/FCC
Operating Frequency 2414MHz;2432MHz;2450MHz;2468MHz
Unobstructed Effective Range 100m (328ft)(Min.)
Modulation Mode FM
Operating Temperature -10 ~ +50(Degree C) / +14~ +122(Degree F)
Operating Humidity ≤85%RH