Retevis H-777 2 Way Radios UHF Long Range 16CH Emergency Portable Walkie Talkies Set (20 Pack) with USB Charging Base Extremely simple operation sturdy two way radio set without needing any training; Preprogrammed to work with each other out of box and can communicate with other brands FRS/GMRS radios by being on the same channel and privacy codes Long distance portable walkie talkies sets with wide range of coverage in city buildings and outdoor events; Necessary accessories includes durable belt clips; lanyard; removable antenna; rechargeable large battery; intelligent USB charging base without adapter Multi features handheld radios with good signal and clear voice; Voice prompt reminds you current channel number; CTCSS codes will build secure conversation in your team; Scanning allows you to locate conversations in progress Commercial grade two way radio with user-friendly configuration; Bright flashlights provide great convenience for your evening work; emergency alert function will release help signals when you press it 1 year warranty and 30 days no reason to return; No matter any reason and within 30 days you can apply for a return including the radio accessories Retevis H-777 is UHF.It is great for team work,because it is easy to handle,and not need to program,can communicate with each other when outof the box.The voice prompt remind youwhenever you turn on the radio with the current channelnumber or select and stop the radio. The radio have the superior cell and can use for a long time,it is the prefect way for the following industry:Service industry(Hotel,Restaurant,Supermarket,etc);Security,Property Management;Police,Constrution Sites,Transportation;Warehouse, Ports, Logistic Industry ,group Travelling, Church security and School service.