You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what is the function of the ptt button on a two-way radio?" whose answer is push-to-talk.
Each document should contain about 30 words, and these documents should contain useful information.

Query: function of the PTT button on a two-way radio
Useful Output:

Doc 1: What is the function of the PTT button on a two -way radio? a. enable duplex transmission b. cause the radio to transmit c. transmit a distress signal
Doc 2: The technical term for PTT is half-duplex transmission, meaning the user can either transmit or listen, but cannot do both simultaneously. These
Doc 3: Push-to-talk is an effective communication method for frontline workers. Learn about the benefits and common uses for PTT in hands-on environments.
Doc 4: You keep the button pressed down while you are speaking. A PTT call is the best, quickest way for a group of people to communicate.
Doc 5: Push-to-talk (PTT) button: The PTT button on the side of the radio has two main functions: – Press and hold down to initiate and call and talk;