Description:Easy to use:1. It can be use for all ages.With it,you can communicate with your every family member and friend freely.2. It also can be used such as camping, skiing, keeping in contact with your children in theme parks, and various outdoor activities;3. Of course it is also the prefect way for the following industry:Service industry (Hotel,Restaurant,Supermarket,etc);Security,Property Management; Police,Construction Sites & Transportation;Warehouse, Ports & Logistic Industry etc.4. The radio is easy to carry,in your hands, feel is smooth and good.The package includes belt clip,you can even put it at the waist or other body location.5. The PTT button is nice and soft, and easy to use, which will be good in the cold if your fingers are a bit numb.6. Built-in Led torch make things easier when in dark environment.7. If you need re-program the radio, please contact us freely, we will provide you the Software for free.Model  Retevis H-777Frequency Range UHF: 400-470MHzAntenna Impedance 50 Antenna Style SMA-FWorking temperature -30~+60 Rated Voltage 3.7V DCOutput power <5WBattery type  Li-ion batteryBattery capacity 1500mAhColor BlackDimension(L×W×H)  60×33×115mm(Not Antenna)Weight 180gDual band or Single band Single bandDual frequency or Single frequency Single frequencyMemory Channel  16CHBasic Function CTCSS/DCS functionBuilt-in Led torchLow battery alarmPower saving functionChinese and English voice promptPC software programmable (If you want reprogram the radios, please feel free to contact us get the software for free.)Package includes:4 × Portable radio (UHF: 400-470MHz)4 × Antenna (SMA-F Antenna)4 × Li-ion battery pack (1500mAh)4 × Charger4 × Belt clip4 × The sling4 × User's manualTroubleshooting GuideNo Power:Check battery installation and/or replace batteries.Voltage Capacity quickly go out.The battery life is over, replace new one.Couldn t Communicate with other group members:Firstly,Please verify that the channel frequency and the CTCSS you are using are the same as those of your groups members. If the channel frequency and the CTCSS are the same, please verify that your groups members are within the radios coverage.Hear the voice from other groups:Please change your CTCSS for the channel. at the same time, you also need to change the CTCSS for all radios in your group. If you don't like this, you may apply another channel frequency.Why can I hear the voice clearly from other groups sometimes, my voice is intermittent:Please check whether the MIC is blocked by something. If so, please return the radio to your authorized dealer for maintenance. Sometimes, your frequency is same as the frequency of other groups.Cant turn on the radio and even it it turned on, it often shuts off automatically:Please check the battery contacts on the radios. If it is broken or twisted, please return the radio to your authorized dealer for maintenance.