What frequency range does the fm transmitter support?

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

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

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

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

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

Approximately how long do the batteries last on the receivers?

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

ASIN	B07W7QM1NW
Batteries	2 AAA batteries required.
Best Sellers Rank	#12,185 in Musical Instruments ( See Top 100 in Musical Instruments ) #89 in MP3 Player FM Transmitters #93 in Wireless Microphone Transmitters & Receivers
Color Name	Black
Customer Reviews	4.1 4.1 out of 5 stars (89)
Date First Available	August 7, 2019
Hardware Interface	3.5mm Audio
Item Weight	1.87 pounds
Item dimensions L x W x H	6.89 x 5.71 x 7.8 inches
Item model number	FY4430A-FY4305A10
Manufacturer	Retekess
Material	Plastic
Material Type	Plastic
Microphone Form Factor	Headset
Number of Batteries	2 AAA batteries required.
Number of Channels	17
Power Source	Battery Powered
Product Dimensions	6.89 x 5.71 x 7.8 inches
Size	6.89in x 5.71in x 7.8in

Retekess Church Translation System with 1 TR503 FM Transmitter Headset and 10 PR13 FM Radio Receivers, Listening System for Factory Museum School Church (1 Transmitter 10 Receivers)

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