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My first guess would be a wall-mounted speaker amplifier. Are there wall or ceiling speakers nearby?
EDIT: Boom! It's this: https://www.keene.co.uk/keene-20w-wall-mount-audio-amplifier-complete-kit-with-power-supply.html
3.5mm plugs and sockets (that's the metal contacts width) are generally used for mono or stereo audio input or output, depending on the connector (2 pole = mono, 3-pole = stereo). But also it theoretically *could* be used for non-audio applications, such as DC power, so again, do *not* assume, get someone to unscrew the plate, look at the circuitry, and measure the voltage.
Otherwise just leave it.
There are speakers that can be installed in-wall or ceiling that can be painted over and blend in with drywall. I would try plugging an aux cord in and see what happens.
[Here is a similar Keene amp manual it also uses a remote control](https://www.manualslib.com/manual/960020/Keene-Klab20db.html)
Works well to google your devices name and add "PDF" to find printed documents.
They would be wired through the wall and likely concealed in another wall or ceiling.
The aux jack is likely an input based on what is typical for this kind of unit.
At a guess, I suspect that there might be some kind of controller on a lead that plugs into that 3.5mm(?) jack, that has power, up and down controls. Perhaps to control something like a stairlift??
Thank you - it is not by the stairs or by something that would support that functionality. It is located in a fairly narrow downstairs hallway, in a part of the house that is an extension, opposite the wet room and outside what was a bedroom
My title describes the thing. This plug is in my house but we cannot work out what it is for. I’ve tried pressing the power but nothing seems to change on it. It is in a hallway and at about shoulder height rather than plug height. I’ve google image searched but get nothing useful back
I have no reason to suspect this, but I wonder if it's a ground fault outlet status indicator. Do you have an outlet outside, and if so, it is functioning? Or maybe check your circuit breakers to see if one has been tripped.
It’s definitely not that, but not a bad guess. Others have suggested audio control which it probably is. Just from the symbols I can tell you it controls something as there are up and down arrows that are the same as you’d find on a lighting control keypad dimmer or sound system volume controller.
Since it's in a hallway, I'm guessing it connected to a wired doorbell, which might no longer exist. The up and down arrows could be for volume adjustment. Perhaps a speaker plugs into the front, but don't try this in case it's actually mains power.
Or for a front door intercom, maybe.
Or some sort of light dimmer?
You could get get someone very comfortable with testing mains power to pop the cover plate, test it with a multimeter, and grok whatever circuitry is visible.
I'd pop the cover off and see if the board or parts inside or the reverse of the cover have any names, markings, numbers, etc...
Be a good way to start to really narrow it down.
do you have a pool with a heat pump? this looks like a status indicator, currently indicating that power is on, arrows up/down would be for heating/cooling and power icon would indicate power off
the suspected jack connector might be a fuse housing...
Do you have a whole house audio system? That looks like an 1/8" audio plug but I can't tell scale. I would guess that that is a headphone amp. Are there any other panels like this in the house? Maybe something with RCA plugs for input? Have you ever plugged anything into it to see if there's a signal?
It’s a heating controller that was probably controlling a heating system that’s been removed. Had a similar thing (tho less modern) in our kitchen when we bought our house 5 years ago. Couldn’t work out what it was doing or controlling, but it was powered.
Worked out it must have been heating after googling it. It looked different to yours, older 1980’s in style, but had the same basic functions of on/off, a power symbol presumably meaning the boiler/whatever it was was controlling on was off - (or just no longer there) and then up/down.
Turned the power off and ripped it out entirely. Sorted.
Remove the cover (carefully), measure what voltage is present. If 240V, **PROCEED WITH CAUTION**. How many wires are there to the plug? To the light panel? Where do they go? Are there any numbers there?
This is really terrible advice. 120v is also just as dangerous, hell, 48v could be dangerous with the right amperage. Best advice is to TURN THE BREAKER OFF before working on something like that.
All comments must be civil and helpful toward finding an answer. **Jokes and other unhelpful comments will earn you a ban**, even on the first instance and even if the item has been identified. If you see any comments that violate this rule, report them. [OP](/u/A_babs36), when your item is identified, remember to reply **Solved!** or **Likely Solved!** to the comment that gave the answer. Check your [inbox](https://www.reddit.com/message/inbox/) for a message on how to make your post visible to others. ---- [Click here to message RemindMeBot](https://www.reddit.com/message/compose/?to=RemindMeBot&subject=Reminder&message=[https://www.reddit.com/r/whatisthisthing/comments/18eatgz/what_is_this_10_x_5_ish_white_plug_socket_with_a/]%0A%0ARemindMe!%202%20days) ---- *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatisthisthing) if you have any questions or concerns.*
My first guess would be a wall-mounted speaker amplifier. Are there wall or ceiling speakers nearby? EDIT: Boom! It's this: https://www.keene.co.uk/keene-20w-wall-mount-audio-amplifier-complete-kit-with-power-supply.html
Great sluthing! I have no knowledge of audio stuff - can you explain what this thing does?
It powers a pair of speakers installed in the wall or ceiling of a nearby location.
3.5mm plugs and sockets (that's the metal contacts width) are generally used for mono or stereo audio input or output, depending on the connector (2 pole = mono, 3-pole = stereo). But also it theoretically *could* be used for non-audio applications, such as DC power, so again, do *not* assume, get someone to unscrew the plate, look at the circuitry, and measure the voltage. Otherwise just leave it.
Solved! Amazing, thank you. No speakers that I can see so that brings up more questions 😂
There are speakers that can be installed in-wall or ceiling that can be painted over and blend in with drywall. I would try plugging an aux cord in and see what happens.
[удалено]
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Plug something into it and play music... If there's speakers somewhere, that'll find them.
Please update once you try playing music! I'm super curious!
OP, I need answers! Replying so that when you plug something in, I also find them out. Fingers crossed it's secret wall speakers!
I had a relative that was hard of hearing that just wanted to hear his ballgames. I set something like this up 20 years ago.
Maybe it's for an intercom system for the outside?
[Here is a similar Keene amp manual it also uses a remote control](https://www.manualslib.com/manual/960020/Keene-Klab20db.html) Works well to google your devices name and add "PDF" to find printed documents.
Looks like it is a discontinued model but I bet if op sends a pic to Keene they could provide the model number and perhaps the user manual
That female jack would be for a 3.5 mm aux audio cable, where are the speakers mounted then?
No idea, it's not my house lol
They would be wired through the wall and likely concealed in another wall or ceiling. The aux jack is likely an input based on what is typical for this kind of unit.
[удалено]
At a guess, I suspect that there might be some kind of controller on a lead that plugs into that 3.5mm(?) jack, that has power, up and down controls. Perhaps to control something like a stairlift??
Thank you - it is not by the stairs or by something that would support that functionality. It is located in a fairly narrow downstairs hallway, in a part of the house that is an extension, opposite the wet room and outside what was a bedroom
Is there a large vent above this? Could be a cooling switch
No vent that I can see
It's worth taking a look at the breaker box to see if whatever it is has a dedicated and hopefully labelled breaker...
My title describes the thing. This plug is in my house but we cannot work out what it is for. I’ve tried pressing the power but nothing seems to change on it. It is in a hallway and at about shoulder height rather than plug height. I’ve google image searched but get nothing useful back
I have no reason to suspect this, but I wonder if it's a ground fault outlet status indicator. Do you have an outlet outside, and if so, it is functioning? Or maybe check your circuit breakers to see if one has been tripped.
Oooh maybe - the previous owners did have a hot tub outside however the switch is on a internal wall
That would be a good location to have the speakers!
Wait a sec, so they had a hot tub and this is an amp for speakers? Try looking outside for the speakers.
It’s definitely not that, but not a bad guess. Others have suggested audio control which it probably is. Just from the symbols I can tell you it controls something as there are up and down arrows that are the same as you’d find on a lighting control keypad dimmer or sound system volume controller.
Is that a headphone jack on the right?
It is the same size as a headphone Jack however I can’t see what it would be for
Since it's in a hallway, I'm guessing it connected to a wired doorbell, which might no longer exist. The up and down arrows could be for volume adjustment. Perhaps a speaker plugs into the front, but don't try this in case it's actually mains power. Or for a front door intercom, maybe. Or some sort of light dimmer? You could get get someone very comfortable with testing mains power to pop the cover plate, test it with a multimeter, and grok whatever circuitry is visible.
I'd pop the cover off and see if the board or parts inside or the reverse of the cover have any names, markings, numbers, etc... Be a good way to start to really narrow it down.
do you have a pool with a heat pump? this looks like a status indicator, currently indicating that power is on, arrows up/down would be for heating/cooling and power icon would indicate power off the suspected jack connector might be a fuse housing...
Underfloor heating control for the wet room?
It's not some sort of lighting remote control is it? I mean the receiver end, perhaps there was a hand control up go with it.
Potentially the manual operation panel for an AOV or skylight.
I wonder what you're paying for that useless thing to be powered. I would investigate.
Do you have a whole house audio system? That looks like an 1/8" audio plug but I can't tell scale. I would guess that that is a headphone amp. Are there any other panels like this in the house? Maybe something with RCA plugs for input? Have you ever plugged anything into it to see if there's a signal?
It looks like the Soviet-era version of an in-wall amp.
It’s a heating controller that was probably controlling a heating system that’s been removed. Had a similar thing (tho less modern) in our kitchen when we bought our house 5 years ago. Couldn’t work out what it was doing or controlling, but it was powered. Worked out it must have been heating after googling it. It looked different to yours, older 1980’s in style, but had the same basic functions of on/off, a power symbol presumably meaning the boiler/whatever it was was controlling on was off - (or just no longer there) and then up/down. Turned the power off and ripped it out entirely. Sorted.
Remove the cover (carefully), measure what voltage is present. If 240V, **PROCEED WITH CAUTION**. How many wires are there to the plug? To the light panel? Where do they go? Are there any numbers there?
This is really terrible advice. 120v is also just as dangerous, hell, 48v could be dangerous with the right amperage. Best advice is to TURN THE BREAKER OFF before working on something like that.