The analog radio is (also known as a traditional walkie-talkie) designed with analog communication technology, which modulates the stored signal to the walkie-talkie's transmission frequency. However，the advantage of the SIM card radio is that it breaks through the limitation of distance. There is no limit to the distance of the national intercom. As long as there is a network, the intercom can be connected.

As an electronic communication device, the walkie-talkie also has certain radiation during use. Unlike mobile phones, tablets and other electronic devices that have been used for a long time, the calls of analog radio are intermittent and only generate high power when transmitting. Therefore, compared with mobile phones, the radiation of walkie-talkies is almost negligible. But the SIM card radio is constantly searching for signals and transmitting beacons as long as it is turned on, and will always release radiation during this period.

In fact, in addition to the electromagnetic radiation generated by electronic devices such as walkie-talkies, mobile phones and tablets, the sun is the most powerful "radiator", with a much higher radiation intensity than electronic products.

Therefore, as long as it is a regular manufacturer's  walkie-talkie, the radiation value is within the national regulations, and will not cause harm to human body. At the same time, as long as we master the correct use method, can also further reduce the radiation of the walkie-talkie.For example,when the walkie-talkie is talking by PTT and is transmitting, please put it in a vertical position, and keep the distance between the microphone and the mouth in roughly 2.5-5 cm, the  walkie-talkie from the head or body at least 2.5 cm.