Question 1

What frequency range does the fm transmitter support?

Accepted Answer

Dear customer,
Thank you very much for your question.
For the Retekess TR503, the FM frequency range is 87.5MHZ to 107.5MHZ.
Hope it can help you. If it doesn't help, you may go to the product page, find the "Sold by Retevis Direct" under "Add to Cart" on the right side of the product page, click on “Retevis Direct”, then click the button "Ask a question" to reach out to us, we are always here for you.
We are the professional FM transmitter manufacturer, if you have any questions about FM transmitters, please contact with us freely.
Best regards

Question 2

Are these loud enough for a dance group to clearly hear the music?

Accepted Answer

For this Retekess Portable FM Transmitter Headset Wireless Tour Guide System These loud are enough for the dance group to hear the music clearly.

Question 3

Can TT105s work with unlimited numbers of pr13 fm receivers? Thank you.

Accepted Answer

Dear customer,
Thanks for your question.
For Retekess TT105, single TT105 transmitter can match countless TT105 receivers of the same model. I'm sorry that Retekess cannot be used with PR13 fm receivers.
Hope this can help you. If it doesn't help, you may go to the product page, find the "Sold by Retevis Direct" under "Add to Cart" on the right side of the product page, click on “Retevis Direct”, then click the button "Ask a question" to reach out to us, we are always here for you.
We are the professional Tour Guide System manufacturer, if you have any questions about Tour Guide Systems, please contact with us freely.
Best regards
Angela

Question 4

Approximately how long do the batteries last on the receivers?

Accepted Answer

Dear customer,
Thanks for your question.
For PR13 FM Receivers, it uses 2 x AAA batteries, but it not included in the package. The lasting time of the battery usually depends on the capacity and the quality of the battery. 
And the different volume will also affects the lasting time. You can divide the capacity of battery by 50MA to calculate the lasting time of the battery.
Hope it can help you. If it doesn't help, you may go to the product page, find the "Sold by Retevis Direct" under "Add to Cart" on the right side of the product page, click on “Retevis Direct”, then click the button "Ask a question" to reach out to us, we are always here for you.
We are the professional radio manufacturer, if you have any questions about radios, please contact with us freely.
Best regards
Angela

Included Components	Lithium battery, earphone, radius
Item Weight	848 g
Microphone Form Factor	Headset
Item dimensions L x W x H	17.5 x 14.5 x 19.8 Centimeters
Power Source	Battery Powered
Number of Batteries	2 AAA batteries required.
Number of Channels	17
Manufacturer	Retekess
Model	FY4430A-FY4305A10
Product Dimensions	17.5 x 14.5 x 19.8 cm; 848.22 g
Batteries	2 AAA batteries required.
Item model number	FY4430A-FY4305A10
Hardware Interface	3.5mm Audio
Tuner Technology	FM
Special Features	Clear sound quality, Expandable & DIY, Long working time, MP3 & Music Player, Portable, portable
Batteries Included	No
Batteries Required	Yes
Radio bands supported	fm

Portable FM Transmitter Headset, Wireless Tour Guide System, 98ft Transmission, with 1 TR503 Transmitter and 10 PR13 FM Receivers for Church Translation, Factory Museum Tour

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