what is the difference between # HT4189 and HT3189 ?

Please check the type of audio output from your TV. If your TV only has a DIGITAL AUDIO 0UT (OPTICAL), then you will need the Avantree HT4189 NOT the HT3189. The HT3189 ONLY works with TVs with a headphone jack or RCA audio OUTPUT port.

Will others be able to listen to the tv through the external speaker while the headphones are in use?

This is a TV feature. Some TV, like some LG smart TV, has the option of 'TV speaker + optical out' at the same time. But not all TV have this function. If your TV does not have such function, then you can use HT5009, which support the Bluetooth headphone and a wired up (either optical or AUX) sound bar / speaker simultaneously. So you can use the headphone and your wife can listen to the sound bar. If not clear, contact support@avantree.com

Are these "over the ear" or "on the ear"? I want headphones that completely surrounds the ear

These have a circular cushion that surrounds the ear, (if your ears are not large ones); and stays on well. I like these better than the Sennheiser one I had for 10 years; except the ear space is smaller on this new Avantee one.

I have two tv's on different floors, both Sony. Can these headphones pair to either one as I needed?

I can connect to different TVs in my house, but not automatically. I use an Optical cable as the television audio out device to connect to the Avantree transmitter. I usually use the headphones/transmitter with my family room's television. However, I sometimes want to use it with the bedroom TV. I disconnect the Optical Cable and USB power cable, which powers the transmitter, from the back of the family room TV, and hook those two connections up to the back of my bedroom TV. I will then get the sound to my headphones and it will only be from the bedroom TV. The family room TV will not spill over to the headphones because the Avantree transmitter is not hooked up to it. More info: the headphones can only be paired with one transmitter. If you have two Avantree headphones/transmitters. you could have headphones set up on two TVs without worrying about spillover from one TVs transmitter to headphones that have been paired with another transmitter.

Noise Control	Sound Isolation
Headphones Jack	3.5 mm Jack
Model Name	BTHT-4189-BLK
Connectivity Technology	Bluetooth
Wireless Communication Technology	Bluetooth
Included Components	1 ps bluetooth headphone with 1ps bluetooth transmitter
Age Range (Description)	Adult
Material	Plastic
Specific Uses For Product	TV Wathcing, Videos and Games
Charging Time	2 Hours
Compatible Devices	Headphone, Speaker
Theme	TV Series
Control Type	Sound
Cable Feature	Without Cable
Item Weight	196 Grams
Unit Count	1 Count
Style	TV Set
Number of Items	1
Cable Length	3 Feet
Battery Life	40 Hours
Audio Driver Type	Dynamic Driver
Bluetooth Range	100 Feet
Earpiece Shape	Over-Ear
Is Autographed	No
Global Trade Identification Number	06945624902535
Manufacturer	Avantree
Wireless Type	Bluetooth
Average Battery Life (in hours)	40 Hours
Item model number	BTHT-4189-BLK
Hardware Platform	PC
Item Weight	6.9 ounces
Item Dimensions LxWxH	7.09 x 6.69 x 3.15 inches
Voltage	5 Volts
Batteries	1 CR5 batteries required. (included)
ASIN	B07CJ2BVSP
Is Discontinued By Manufacturer	No
Date First Available	June 3, 2018

Avantree HT4189 40Hrs Wireless Headphones Set for TV Watching with Transmitter (Digital Optical AUX), No Delay, Dual Link Support, High Volume Over Ear Headset for Seniors, Long Range

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