Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: I understand only 1 person can speak at a time.  Does the unit send a "chirp" to indicate a person is finished speaking, so another person can begin?
Document: We purchased the radios to keep in communication when setting up and orchestrating a fireworks show. The radios were great, we were able to speak with each other and hear each other regardless of the noise around us. While the MC was speaking I unplugged my headset and turned up the volume and everyone around me was able to hear the speaker through the radio. We had the speaker keep the mic open on the radio so the crew in the back could hear. The ear pieces work great.
I really like these radios, they have helped me out since i got them. We use them for motorcycle rides and with my security company. They have great sound and receptions. I would be buying another set of these soon.
These radios worked great and everyone who used them were extremely satisfied. I plan on buying another 5 pack. I used these on a campground as part of our communication for our Walk To Emmaus Men's Walk. The women will also be using these. No complaints !!!!! !
Great walkie talkies. I use these for my hotel maintenance, housekeeping and front desk to communicate. They work great and save a lot of time.
Received this product just in time for our big event on Friday. Charged them all and handed them out today. They are easy to use and work wonderfully. I will  recommend this product and seller to others in my organization.
I work part time in a night club. I recently purchased radios from Walmart and there was just too much interference with the radios and other people on the same channel. Plus the radios didn't hold a charge. I bought these for the club and no interference and it holds a charge and the communication is Chrystal clear
You cannot beat this deal. Purchased for supervisors in a bakery setting with concrete walls. A little skeptical at first but after we implemented them, the result was phenomenal. So much that we purchased another set of 5. Great product!
Easy to use and work greatSound quality is good.Light weight.Great product, we purchased another set of fiveThe battery charge last: heavy use all day, light use about 3 days
I've been using these radios for almost a month now in a ministry setting. I ordered 10 to start, just ordered 5 more. I love them! Great build quality and easy to use. I wanted something that was hard to mess up, dials for power and channels help achieve that simplicity. The ear sets that come with the radios aren't great, I ordered different ones, found one stopped working well the first time I used it. Over they are a fantastic radio and the price is great!
We use the radios 7 days a week and Will need more time to see its performance. A little to early to tell.
Answer: No.  There is no signal from the unit to indicate a transmission has stopped.  You have to use something like the standard "over" to indicate you have finished speaking.