Uses 1 time for communications on a 3 day cruise. They are in perfect condition and come as shown with everything that came new
4 x Batteries
They work much better than your typical GMRS or FRS radios since 900mhz will bounce around the ship.. They transmit at 1 watt, similar to other 900MHZ radios such as the DLR and DTR radios.
These are analog and DMR capable in the 900mhz 33cm band. They are not frequency hopping ( FHSS), but do have similar coverage as the DTR and DLR radios.
Retevis has the programming software on their web page. Click on support tab to download the software. https://www.retevis.com/rt10-two-way-radio-for-business-128-channel-900-mhz-us