The frequency range of walkie-talkies is UHF 400-470MHz. Each radio has 16 preset channels and the same frequency for direct use. When you turn the channel knob, you can easily change the channel and the voice will tell you the channel number. The frequency of the channel is programmable within the frequency range; You can program any of the 50 CTCSS audio and 105 CDCSS audio on each programmed channel.Each two-way radio is equipped with a 1500mAh rechargeable lithium ion battery and a us charging stand. It takes about 4-5 hours to fully charge, and the sustainable use time of a full charge is about 8-12 hours, depending on the amount of use. When the battery is too low, the walkie-talkie will automatically broadcast low battery.High-quality built-in speakers and microphones on radios provide a loud and clear sound. Unique noise reduction function, even in a noisy environment can maintain clear voice. Walkie-talkie has VOX function. Each walkie-talkie comes with a single-ear headset (k-type headphone plug with 3.5mm and 2.5mm plugs); When the earpiece is plugged in, all the sound is transferred to the headset, and you can talk directly through the headset microphone.The range of long-distance walkie-talkie communication depends very much on the terrain. Walkie-talkies can communicate up to 5km in places where there are no obstacles (such as at sea). Radios are more suitable for construction teams, fire departments, warehouses, factories, hotels, churches, schools, road trips, family camping and hunting, cruise ships, the mountains. In some cases is more stable than a mobile phone, especially in remote areas or in the wild where the reception is poor.Walkie-talkie has a strong case, using environmentally friendly PC materials and superb technical performance. Anti-bending antenna, durable switch, comfortable button. Equipped with LED flashlight, can bring great help in the dark night. This 100% satisfactory shopping experience. If you have any quality problems with your walkie talkies,  This is a risk-free purchase, so don't delay order yours today!