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1  Is the rt21 compatible with h777? My coworkers have the h777s but I want the rt21.
Yes, RT21 can compatible with H777, Under frequency and CTCSS is same, they are communicate with each other Could you tell me how many do you need? we can provide a discount price for you
2  Is there a way to get the radio to beep when you press the transmit button and when you receive call?
Hello Robert, RT21 radio hasn't beep function, so sorry for that, Thanks for your suggestion, we will update it Brgds
3  Hello Where can I download the programming software for the RT21 and RT81? Thanks and Greetings Stephan
A blog about how to program radios : http://blog.retevis.com/retevis-radio-frequency-programming/
4  Do you make a mult-charger for the rt21 radios?
Hello TIMOTHY, RT21 hasn't mult-charger, so sorry for that, will take your demand to our developer If it will appear, will timely contact you, Thanks for your support Brgds
5   i cannot get any transmission in or out when i turn the radio on it informs me of the channel then the red light comes on
Hello Kevin, If two radios can communicate with each other, keep the frequency and CTCSS same, so pls check your frequency and CTCC if it's same Brgds
6  After the download the software for RT21 shows error message and can not be used. With RT1 and H777 everything is OK. Need a solution otherwise i have to return the equipment to the seller. Greeting Ralf
Any pictures to show the error ? Or you could try to program by Chirp -- http://chirp.danplanet.com/projects/chirp/wiki/Home
7  Buenas tardes, Acabo de comprar 4 emisoras RT21 y quisiera saber con que potencia, frecuencias y canales CCTS/DCS vienen programas de serie. Gracias
Hello Rafael, We will send email to you, pls notice check it, thanks Brgds
8  Can I bay additional batteries for RT21 with micro usb ports (Like TR21 with Car USB Charger option)?
Hello Dmitriy, Could you tell me your shipping address? let us check if can send pure battery to your country Best regards
9  Hi, I bought 2 x RT21 units and re-programmed them & love them. Then a friend bought another 2x... but we having trouble programming one unit. It is constantly giving me a "Runtime error 6 overflow" when i try and read the handset using the rt21.exe I have done nothing different with this unit. Can you please help. Thanks Damien (in Australia)
Dea Damien, Here's a blog for you reference‘What shall we do when can not programming radio?’ http://blog.retevis.com/shall-can-not-programming-radio/ Bes regards
10  I purchased 5 rt21 radio's and the disk to program them with the cable; but it does not work with windows 10. can you send me a link to the correct software?
Please download RT21 usb driver and RT21 software from Retevis official website: http://www.retevis.com/resources-center/ Attached a photo for you reference: