How do I get my Slick HP 921 Wireless headphones to work

No it isn't normal. This is a set that you plug into the television and it transmits the signal to the wireless headphones. It sounds like the transmitter unit is picking up interference. We can test it! The headphones can be connected directly with a wire. Try that on the television earphone jack, or on a cellphone, a radio, MP3 Player or a computer audio jack. If the audio is clear, with no hiss, then you know the problem is the transmitter unit. Move it as far away as the wires allow from the television and anything electronic.

It is advertised here on Amazon and the diagram shows how it can be connected, 4th image down on upper left.

5-in-1 Wireless Headphones Headset MH2001 MP3 MP4 ...

Amazon.ca https://www.amazon.ca > Wireless-Headphones-Heads...

5-in-1 Wireless Headphones Headset MH2001 MP3 MP4 PC CD DVD Audio TV FM Radio-Listen to Music, Chat Online & Monitor Other Rooms! : Amazon.ca: Electronics.
More here regarding the hissing sounds

https://www.google.com/search?q=mh2001+wireless+headphones+hissing+sound

Yes. The headphones need to have an available connection from the DVD to the wireless headphone transmitter.


Hope this helps?

1. Bluetooth option: need to buy a USB Bluetooth adapter (make sure it supports Bluetooth A2DP profile and (optional) AVCP profile and Bluetooth speaker or Bluetooth headphones (or both speaker and headphones). I have to warn you that finding a Bluetooth adapter that works with yor computer may not be an easy task.
2. Regular wireless headphones (no speaker). Attach the transmitter piece to your jukebox's headphone jack and listen through the headphones from anywhere in your home.

Wireless head phones works on principle of wireless technology.
The phone has a reciver and tv or Audio system has a transmitter ,.
WiFi/blue tooth are examples.

Instructions
1
Set up the transmitter. Wireless headphones rely on a transmitter that sends audio via infrared or radio waves to your headset. Use the digital audio output (coaxial or optical), RCA outputs (red and white) or headphone jack on your TV to connect the transmitter. The connection will depend upon which outputs are available on your TV and/or the transmitter.
2
Use an RCA-to-headphone adapter. If you don't have a headphone jack on your TV and the transmitter includes only a headphone connection, connect an RCA-to-female headphone connector. This will allow you to plug the wireless transmitter into the female headphone end and then hook the RCA ends into your television's audio outputs. You may also need a 3.5 mm (mini jack)-to-1/4-inch adapter if the headphone plug on the transmitter doesn't match the television jack.
Read more : http://www.ehow.com/how_4883556_use-wireless-headphones-tv.html
3
Set the transmitter on top of, or next to, the television. For infrared transmitters, you'll need a direct path between the headphones and the transmitter. Placing the transmitter on or near the TV will allow you to take advantage of the clear path you already have.
4
Plug in the transmitter and turn it on. Charge the headphones if necessary.
5
Turn on the headphones. Adjust the volume and settings and you're ready to watch TV.
Read more : http://www.ehow.com/how_4883556_use-wireless-headphones-tv.html

good luck

Headphones are a convenient way to experience audio-rich entertainment on your own terms. Headphones allow you to customize your listening level without disturbing other people in your general vicinity. Headphone cables can be a hassle, however, so many new headphone models feature a wireless connection. PCs tend to be wire jungles, so eliminating one wire from a potentially jumbled mess can be an intriguing feature of wireless headphones. Connecting wireless headphones to your PC allows you to take advantage of the benefits of listening to your movies, music or games through headphones without the struggle of the headphone cable.

Charge up or place batteries in your headphones and transmitter. Wireless headphones require power to function. Many wireless headphones come with a charger base. You need to charge your headphones before you attempt to connect them to your PC. Some wireless headphone models require batteries, which you must install before you connect the headphones to the PC. Connect the transmitter to your PC. The transmitter may connect via the PC's headphone jack or USB port. If the transmitter connects to the headphone jack, plug it in and check your headphone's user guide to verify how to synchronize the headphones to the transmitter. If the transmitter connects via USB, you will likely need to install software to use your wireless headphones. If your wireless headphones are Bluetooth-compatible, continue to the next step. Pair your headphones via Bluetooth to your PC. If your PC is not Bluetooth-equipped, you will need to install a Bluetooth USB dongle. Turn on your headphones and open the Bluetooth software on your PC. Scan for Bluetooth devices from your PC. Your headphones should appear. Select the headphones and follow any further instructions to complete the pairing process. Test the headphones. Pick out a song or a video and play it on your PC. Connect your wireless headphones and verify that you can hear the audio. Find the volume controls on your headphones and adjust them to make sure the volume changes correctly. If your headphones are not functioning properly, verify that the headphones are turned on. If the headphones are on and you do not hear anything, verify that your transmitter is functioning properly and that you have your volume turned up on your PC. Recharge your headphones when you are finished using them. To ensure that the headphones are ready anytime you need them, you must always place them on the charging base when you are finished using them. If the headphones are battery-powered, be sure that you always have spare batteries on hand. Hope this helps.

its no wireless its bluetooth i guess,, correct me if im wrong

I had the same problem when I plugged it into a new HDTV. The problem was that the sound on the TV was set too low. The transmitter has a feature that automatically turns off when the signal is off or too low. Try turning up the TV volume to a high/higher level and it should solve your problem. Using the headphone jack with the white input allows you to use the headphones while bypassing the TV speakers.

They need a minimum level of signal to switch on the transmitter.
Verify if it works on yet another system.
Make sure you have the right output on your Samsung.
Try to increase the output level of your Samsung...(up the volume, but it may be a fixed output..)

If you're handy, you could rig up a wireless solution to this. The problem is that you have two screens, each presumably playing a different movie. If you purchased an off-the-shelf wireless transmitter accessory, you could connect it to one of the screens. But then if you purchased a second wireless transmitter accessory, and connected it to another screen, you would need to make sure both wireless transmitters were operating on different frequencies, so that each person could wear a different pair of headphones and listen to their own movie. Hopefully this makes sense. You could use either an FM Modulator to do this, or an Infrared Audio (IR) transmitter... Remember, these units aren't like factory installed headrest systems; they don't have the wireless audio transmitter already built-in, so you can't just buy wireless headphones and listen to them.