First of all, we need to make it clear that the functions of mobile phones and walkie-talkies are different. In other words, before we design these two products, we have different market positioning for them, and thus create different designs. .

The communication method can be simply divided into two types: wired (including erecting optical cable, cable or leased telecommunication line) and wireless (divided into establishing dedicated wireless transmission system). In comparison, the u

1. Use original or approved batteries. 2. If a metal conductor such as jewelry, keys or beads touches the exposed electrode of the battery, all batteries may cause damage or personal injury. Be careful with batteries that have been charged, espe

A trip on the way home, you select the contacts are mostly mobile phones, but now, the addition of a

Digital radio has a vast market in our country, but has since not been rational development. The introduction of a series of national policy for digital radio development paved the way.