The radio mixed the analog and digital communication mode, allow users to easy migrate from analog channel to digital channel.It is exceptionally easy to use. Most users will stay on one channel, though 128 are available. We designed this two way radio to work with an earpieces, so when you change channels, it announces the channel to you.Communication distance: 2-4km for barrier-free straight-line distance, 1-3km for urban area, 1-35 floors for single building.Fully charged, can be used for 20 hours with 15% transmission frequency, and can be on standby for 48 hours.Function: Hidden dot matrix screen/anti-drop, dust and rain/-key alarm function/monitoring function/Tail sound elimination function/noise level setting/voice control function (V0X) etc.