A sync box for a TV backlight sits in the HDMI path. Your console plugs into the box, the box plugs into the TV, and everything your console outputs has to pass through it untouched.
For streaming that's undemanding. For a PS5 or Xbox Series X it isn't. These consoles output 4K at 120Hz, variable refresh rate and auto low latency mode — and a sync box built around HDMI 2.0 will quietly strip some of that out. You paid for a 120Hz console and a 120Hz TV, and a ₹5,000 accessory in the middle drops you to 60.
This is the single thing to check before buying, and most product listings don't make it easy.
What a sync box must pass through for console gaming
4K at 120Hz
Both current consoles support it, and a growing number of games run at it. This needs HDMI 2.1 bandwidth. An HDMI 2.0 box caps you at 4K 60Hz — the console will negotiate down without telling you, and unless you check the display settings you may never notice you lost it.
VRR — variable refresh rate
Matches your TV's refresh rate to the console's frame output, which removes screen tearing and smooths out frame drops. It's one of the biggest visual improvements of this console generation. A box that doesn't support VRR passthrough disables it entirely.
ALLM — auto low latency mode
Tells your TV to switch to game mode automatically when the console starts. Without passthrough, you either lose it or switch picture modes by hand every session.
HDR formats
Dolby Vision and HDR10 need to survive the trip. A box that mangles HDR metadata produces washed-out or over-dark images, and it's often blamed on the TV rather than the accessory causing it.
Audio
Dolby Atmos passthrough matters if you run a soundbar or receiver. Some sync boxes downmix audio, which is not something you want discovered mid-film.
The port problem nobody mentions
Most sync boxes have one HDMI input. If you own a console, that port is spoken for — and your set-top box, streaming stick or second console has nowhere to go.
In practice people either unplug and replug cables, or they route the other devices straight to the TV and lose sync lighting on everything except the console. Neither is what you bought the kit for.
If your setup has more than one source, port count matters as much as the specifications.
Why camera and microphone sync don't work for gaming
Cheaper "sync" lighting doesn't read the HDMI signal at all.
Camera-based systems clip a camera to the TV pointing at the screen. They see room lighting, reflections and anything passing in front of the set. In a dark gaming room they're inconsistent, and the lag between action and light is visible.
Microphone-based systems pulse to sound rather than picture. Lively, but unrelated to what's on screen — an explosion behind you lights the same as one in front.
For fast-moving games, only HDMI sync tracks accurately enough to be worth having. Do you need an HDMI 2.1 sync box for your TV backlight? goes into the standards in more detail.
The Mitsuko AmbiMotion 2.1 Pro
The AmbiMotion 2.1 Pro is built for exactly this situation.
Three HDMI 2.1 inputs. Console, set-top box and streaming stick all stay connected. Nothing gets unplugged, and all three sync.
Full passthrough on every port — 8K at 60Hz, 4K at 120Hz, Dolby Vision, Dolby Atmos, VRR and ALLM. The console negotiates its full output whichever input it's on.
A denser strip. 60 LEDs and 28 chips per metre, roughly 50% more than typical market backlights. Density is what keeps colour transitions smooth rather than blocky, which shows most on a large screen during fast scenes.
Kits cover screens from 27 to 120 inches, and everything is controlled through the Smart Life app with Alexa and Google Assistant support.
If you don't need three ports
The AmbiMotion 2.1 is the same HDMI 2.1 sync box with a single input. If the console is your only source running through the box, it covers console gaming properly without paying for ports you won't use.
The AmbiMotion 2.0 and 2.0 Pro are HDMI 2.0 kits at 4K 60Hz. They're the right choice for streaming and set-top boxes, but they'll cap a current-generation console — worth being clear about rather than finding out later.
The full range is in TV Lights.
Before you order
Two things catch people out.
Your TV needs an HDMI 2.1 input too. A 2.1 sync box can't deliver 4K 120Hz to a TV that only has 2.0 ports. Check your TV's specification — many mid-range sets have 2.1 on one or two ports only, so use the right one.
Sync needs an external source. Because the box reads the signal passing through it, watching via your TV's built-in apps produces no signal to read. For consoles this is a non-issue, but it matters for the rest of your viewing. Do I need a Fire TV Stick for a TV backlight? covers it.
Common questions
Will a sync box add input lag?
An HDMI 2.1 box passing the signal through adds no meaningful latency. Lag complaints almost always trace to camera-based systems or to a box forcing the console down to a lower mode.
Does it work with Nintendo Switch?
Yes. The Switch outputs 1080p, well within what any of these kits handle.
Can I keep my soundbar or receiver connected?
Yes. Run the console into the sync box, the box into the TV, and audio out to your sound system as normal. Dolby Atmos passes through intact on the 2.1 Pro.
Does the lighting work when I'm not gaming?
Yes. Sync is one mode among several — static colours, scenes and schedules all run through the Smart Life app whether or not anything is playing.
Which size do I need?
Measure the perimeter of your TV's back panel — width plus height, doubled — not the diagonal. Kits cover 27 to 120 inches across three variants.