Two-way radios, also known as walkie-talkies, are communication devices that can transmit and receive audio signals over a certain distance. They are typically used in areas where mobile phone reception is poor or unreliable, or where immediate and real-time communication is needed, such as in construction sites, event management, security teams, and outdoor adventures. Two-way radios come in various types and models, including handheld radios, vehicle-mounted radios, and base station radios. They can also operate on different frequencies, including very high frequency (VHF), ultra-high frequency (UHF), and citizen band (CB) frequencies. 

When choosing a two-way radio, it is important to consider factors such as the required range, battery life, durability, ease of use, and available features such as weather alerts, noise reduction, and emergency buttons. It is also essential to comply with relevant regulations and obtain any necessary licenses for the use of certain frequencies.