Model : CN-888
Frequency Range : UHF (400-470MHz)
Communication Range: 5-8 KM
Voltage : 7.4V
Channel Capacity : 99
Antenna Type : External
Product Size : 101x53x38MM
Output Power : 6W
Audio Power : 1W
Battery Capacity : 1100mAh
Weight : 228.8GM
Warranty : 1 Year for Device
1 Month for Battery
1 Month for Charger
Additional Features : Voice Prompt
LCD Display
Headsets Included
Programmable by PC
Reverse frequency function

If there is static on the call, it indicates interference on the channel; thus, it is necessary to switch to a different channel.
switch channel
1. Turn on the walkie-talkie
2. Press the red button 
3. Press the * button to lock
4. Press the AB button to switch the channel