Fancy LEDs FSB3P2.1 3-Port HDMI 2.1 Sync Box
Overview
The Fancy LEDs FSB3P2.1 3-Port HDMI 2.1 Sync Box sits at the premium end of the ambient lighting market, built specifically for large-screen setups between 70 and 95 inches. Unlike cheaper bias lighting kits, this sync box pulls color data directly from the HDMI signal — no camera needed, which means consistent accuracy without the drift or calibration headaches that plague camera-based alternatives. The RGBW LED system is a genuine step up from standard RGB strips, adding a dedicated white diode that makes neutral and bright scenes look far more natural. One thing worth knowing upfront: Smart TV apps won't sync — you need an HDMI device like a streaming stick or console plugged in.
Features & Benefits
Three full HDMI 2.1 ports handle 4K at 120Hz, with VRR, ALLM, HDR, and Dolby Vision all supported — so whether you're running a PS5, Xbox Series X, or a 4K streaming device, nothing gets left behind. The RGBW strips pack 96 LEDs per meter, and that extra white channel makes a real difference in how the lighting handles bright daylight scenes or white-heavy content. HDCP 2.3 compliance is another practical win: protected streaming content plays without triggering black screens, which has been a frustrating issue with older sync boxes. Control runs through a smartphone app via Bluetooth or Wi-Fi, and setup is straightforward enough for most users to complete without technical headaches.
Best For
This ambient lighting system makes the most sense for people who already own a large TV — think 75 inches or above — and want the room to actually react to what's on screen. Gamers running a console or high-refresh setup through an HDMI source will get the most out of lag-free color response, especially during fast-paced scenes. Streaming enthusiasts using Apple TV, Fire TV Stick, or a similar HDMI device will find the sync reliable and consistent. It's also a strong pick for anyone upgrading from an older RGB system who wants more accurate whites. Budget-focused buyers or those relying on built-in Smart TV apps should look elsewhere.
User Feedback
Among verified buyers, the Fancy LEDs sync box holds a solid overall rating, and the recurring praise centers on how genuinely immersive the lighting effect feels once it's running. Many users highlight the easy installation process and the noticeable color accuracy compared to older or cheaper systems. The RGBW improvement over standard RGB gets specific mentions from those who upgraded. On the critical side, a handful of reviewers report occasional app connectivity hiccups and a learning curve during initial calibration. The Smart TV app limitation catches some buyers off guard — a few low-star reviews trace back to this misunderstanding rather than any hardware flaw. Compared to pricier competitors, most buyers consider the overall package fair for what it delivers.
Pros
- Three HDMI 2.1 ports mean you can keep a console, streaming device, and another source all connected simultaneously.
- RGBW strips produce noticeably more natural whites compared to standard RGB alternatives, especially during bright or daytime scenes.
- Color data is pulled directly from the HDMI signal, so accuracy stays consistent without any camera drift or recalibration.
- Full 4K 120Hz pass-through with HDR and Dolby Vision support means no compromise on picture quality for your connected devices.
- HDCP 2.3 compliance keeps protected streaming content playing without black screen interruptions.
- Setup is approachable enough for non-technical users, with most buyers reporting a complete install in under 30 minutes.
- The ambient lighting system responds quickly enough during fast-paced gaming that immersion stays intact rather than breaking.
- Universal power adaptor included makes this a practical purchase for international buyers or cross-region gifting.
Cons
- The companion app drops connections more often than the hardware price tag would suggest is acceptable.
- Smart TV built-in apps produce no sync at all — a dealbreaker that is easy to overlook before purchasing.
- The instruction booklet is thin, leaving users who hit a first-time pairing snag without much in-box guidance.
- LED strip adhesive can lose grip on textured or curved TV frames after several months of use.
- No physical input indicator on the box itself means checking the app just to confirm which source is active.
- Bluetooth pairing occasionally requires multiple attempts after a phone restart or network change.
- Buyers using only one HDMI source at a time will find the three-port premium hard to justify against cheaper single-port options.
- The box footprint is bulkier than it looks in product images, which can be a fit issue on crowded AV shelves.
Ratings
The scores below were generated by AI after analyzing verified buyer reviews worldwide for the Fancy LEDs FSB3P2.1 3-Port HDMI 2.1 Sync Box, with spam, bot activity, and incentivized feedback actively filtered out. This sync box attracted a broad range of users — from dedicated home theater builders to console gamers — and the ratings reflect that diversity honestly. Both the genuine strengths and the recurring frustrations are represented transparently, so you can make a fully informed call.
Color Accuracy
RGBW LED Quality
Setup & Installation
App Experience
Input Lag & Sync Speed
HDMI 2.1 Compatibility
HDCP 2.3 & Streaming Reliability
Smart TV App Compatibility
Build Quality
Value for Money
Multi-Device Flexibility
Lighting Coverage for Large TVs
Connectivity Stability
Out-of-Box Experience
Suitable for:
The Fancy LEDs FSB3P2.1 3-Port HDMI 2.1 Sync Box is purpose-built for serious home theater owners who have already invested in a large TV — ideally 75 inches or above — and want the room's lighting to actively participate in the viewing experience. If you run a PS5, Xbox Series X, or Apple TV through your setup, this sync box slots in cleanly and delivers genuinely responsive ambient lighting that keeps pace with fast gameplay and cinematic content alike. The three HDMI 2.1 ports make it especially practical for households with multiple active HDMI sources, eliminating the constant cable swapping that single-port alternatives force on you. Buyers upgrading from older RGB bias lighting will notice a real improvement in how neutral and bright scenes render, thanks to the RGBW strip's dedicated white diode. It also suits international buyers well, since the universal power adaptor removes any regional compatibility concerns straight out of the box.
Not suitable for:
If you rely primarily on your TV's built-in Smart TV platform — Samsung Tizen, LG webOS, Sony Google TV, and similar — this ambient lighting system will not sync with those apps, and that is a firm limitation, not a setup issue you can work around. Buyers who own a smaller TV, say 65 inches or below, will likely find the product feels over-specified and overpriced for their actual needs. Those who are sensitive to app reliability issues should also proceed cautiously: the companion app has a documented history of connectivity hiccups that can interrupt an otherwise smooth experience. If you are looking for a budget-friendly entry into bias lighting, the price tier of this sync box positions it firmly in premium territory, and the value proposition only holds if you are using the full feature set regularly. PC-only users are also explicitly advised against this setup by the manufacturer, making it a poor fit for desktop gaming environments.
Specifications
- Brand: Manufactured by Fancy LEDs under model designation FSB3P2.1.
- Dimensions: The unit measures 6.6 x 4.1 x 9.1 inches and weighs 1.81 pounds.
- HDMI Version: All three ports operate at HDMI 2.1 specification, supporting the full bandwidth required for next-generation devices.
- HDMI Ports: Three HDMI 2.1 input ports are included, allowing multiple sources to remain connected simultaneously.
- Max Resolution: Supports pass-through up to 4K at 120Hz and 8K at 60Hz depending on the connected source device.
- HDR Support: Compatible with HDR10 and Dolby Vision, preserving the full dynamic range of supported content.
- VRR & ALLM: Variable Refresh Rate and Auto Low Latency Mode are both supported, benefiting console and PC-adjacent gaming setups.
- HDCP Version: HDCP 2.3 compliant, enabling reliable pass-through of protected 4K and 8K streaming content without black screen errors.
- LED Type: RGBW LED strips are included, featuring a dedicated white diode alongside standard red, green, and blue channels.
- LED Density: Strips are rated at 96 LEDs per meter, providing a smooth and continuous lighting gradient across large screen widths.
- Color Sync Method: Colors are extracted directly from the HDMI data signal; no camera is used or required at any point.
- Connectivity: The unit connects to smartphones and home networks via both Bluetooth and Wi-Fi.
- Control Method: All lighting modes, brightness, and sync settings are managed through a dedicated smartphone app.
- TV Size Range: Designed for TVs between 70 and 95 inches; strip length and coverage are optimized for this screen size range.
- Power Adaptor: A universal power adaptor is included in the box, compatible with US, EU, AU, and UK mains sockets.
- Form Factor: The sync hardware ships as a standalone TV box that connects inline between your HDMI source and your television.
- Supported Features: ARC and CEC are supported alongside the HDMI 2.1 feature set, enabling broader compatibility with modern AV configurations.
Related Reviews
BolAAzuL 2-Port HDMI 2.1 KVM Switch
Seiryruc 2 Port HDMI KVM Switch 2 In 3 Out
ANXQQ HDMI 2.1 KVM Switch 8K@60Hz 2 Port with Wired Control
DGODRT HDMI USB KVM Switch 2 Port Selector Box
Vantec NexStar JX NST-358SU3-BK USB 3.2 Gen 1 eSATA 3.5″/2.5″ SATA III HDD/SSD Enclosure
TESmart HKS201-P23 USB 3.0 HDMI KVM Switch 2 Port 4K@60Hz
AVIDGRAM HDMI 2.1 Switch 5-in-1
FERRISA 8K HDMI 2.1 Switch 4-in-1
Camgeet KVM Switch 3 Monitors 3 Computers HDMI+2 DisplayPort
