Can't connect red one

It should connect, please follow the steps below - 1. Turn on both headphones. 2. Turn OFF and BACK on the transmitter. 3. Wait 3-5s for it to auto-reconnect to the transmitter. IF the RED headphone NOT, you can: 3.1. Wait for 3s and then quickly tap the middle silver button ONCE. You will hear a long beep, and the RED Headphone will announce 'Connected'. 3.2. If RED headphone failed to reconnect, quickly tap "2" button on the transmitter once and WAIT 3-5 seconds. The RED Headphone will announce 'Connected'. You can learn more details by this link - https://avantree.com/product-support/BTHT-41899-BLK#ht41899-how-to-connectreconnect-the-red-headphone-to-the-transmitter. Any question please feel free to contact us at support@avantree.com.

Can these connect to the seat-back movie/tv screen on airlines, using an aux cord? I prefer watching movies on that instead of my tablet.

Yes, you can connect the transmitter to the headphone jack and enjoy movie wirelessly. You can even connect the headphone directly to the port with wire. Of course, if use on airlines, we suggest Aria Pro / Me series as those come with Active Noise Cancellation.

Can I adjust the volume for each headphone set individually? Or is a “global” volume set from the base unit?

Each individual headphones can control it's own volume level and it is not controlled by the base unit transmitter.

Can one headphone be linked to a Fire Tablet and used away from the home (a nursing home)?

The headphones require the transmitter. If you plan on one headset being in one location and the other in another then the answer is no. That is of course unless both locations are within range of the transmitter. Shocking that the manufacturer didn't make this clear.

Noise Control	Active Noise Cancellation
Frequency Response	20000 Hz
Headphones Jack	3.5 mm Jack
Model Name	HT41899
Connectivity Technology	Bluetooth
Wireless Communication Technology	Bluetooth
Included Components	Headphone Stand, Headphones * 2, Optical Audio Cable & 3.5mm Audio Cable, Transmitter, USB Power Cable
Age Range (Description)	Adult
Material	Plastic
Specific Uses For Product	TV Watching, Calling, Music
Charging Time	40 Hours
Recommended Uses For Product	Watching TV
Compatible Devices	TVs equipped with optical (TOSLINK), AUX (3.5mm), or built-in Bluetooth audio outputs
Control Type	Volume Control
Cable Feature	wireless
Item Weight	882 Grams
Water Resistance Level	Not Water Resistant
Frequency Range	20Hz-20KHz
Customer Package Type	Flat Free Package (FFP)
Net Quantity	2 Count
Style	HT41899
Control Method	Touch
Number of Items	1
Controller Type	Button
Battery Life	40 Hours
Audio Driver Type	Dynamic Driver
Bluetooth Range	10 Metres
Bluetooth Version	5
Carrying Case Weight	882 Grams
Carrying Case Color	Black or Red or Gray
Audio Latency	40 Milliseconds
Earpiece Shape	Over-ear
Number of Power Levels	1
Series number	41899
Special Feature	Bluetooth 5.0, TV Headphones with Transmitter & Charging Dock
Manufacturer	Avantree
Model	BTHT-41899-BLK
Product Dimensions	19 x 8 x 17.5 cm; 882 g
Batteries	2 Lithium Polymer batteries required. (included)
Item model number	BTHT-41899-BLK
Hardware Platform	PC, Tablet
Hardware Interface	Bluetooth 5, Headphone, USB
Special Features	Bluetooth 5.0, TV Headphones with Transmitter & Charging Dock
Microphone format	Built-In
Batteries Included	Yes
Batteries Required	Yes
Battery cell composition	Lithium
Cable feature	wireless
Form Factor	Over ear
Includes Rechargeable Battery	No
Manufacturer	Avantree
Country of Origin	USA
Item Weight	882 g

Avantree HT41899 Dual Bluetooth 5.0 Wireless Headphones for TV Watching (Set of 2) with Transmitter (Optical AUX RCA) & Headset Stand, Individual Volume Control, 40Hrs Playtime, Plug n Play, No Delay

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