Registration-free Intercom: After receiving the product, you only need to insert your own SIM card. After 2 minutes of powering on the product, you can use the 4G POC network function for nationwide intercom (SIM card not included). 5000-Mile Walkie-Talkie: This device operates via 4G networks, enabling real-time nationwide communication with single calls lasting over 30 seconds. Even without signal, it supports short-range analog walkie-talkie mode, offering 1-2 miles of coverage in outdoor environments. 4G POC Network: This POC walkie-talkie can use 4G network signal. When you travel outdoors, you can very easily communicate with your friends who are farther away. 8800 mAh Battery: The walkie-talkie can use a large capacity battery. Under normal circumstances, it can support you for 3 to 5 days of use. Notice: The Sim card is not included, you need to buy it yourself. If you purchase more than 2 units, please reply us the group name (such as, "amzct012")via Message. We will help you to put all the devices in a group so that you can intercom. 2 x KSUN CT58