TP-Link Deco S4 AC1900 Mesh WiFi System 3 Pack
- 3 mesh units, up to **5,500 sq ft** coverage
- AC1900 dual-band Wi-Fi 5 (802.11ac)
- 2 Gigabit Ethernet ports per unit, WAN/LAN auto-sensing
- Replaces a router and extender, access point mode
- Works with Alexa
- 4.2 pounds total, 3.57 x 3.57 x 6.39 inches
- 2 year manufacturer warranty
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A three-unit mesh system that blankets a large home with one network name and replaces a router and extender. It uses an earlier Wi-Fi generation, so it does not offer the newest standard's features.
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ASIN: B084GTH5LLModel: Deco S4(3-Pack)Category: Whole Home & Mesh Wi-Fi Systems
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Styles Available
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Overview
TP-Link supplies three matching units that talk to each other over dual-band radio and share one network. Any unit can act as the router, each has gigabit Ethernet ports, and an Ethernet cable and power adapters are in the box.
Weak corners get even coverage from one system, with fewer drop-outs when moving between rooms. The limitation is the earlier Wi-Fi generation, which lacks the newest standard's features.
Who it's for
A multi-floor home or a house with thick walls is where mesh pays off. People with a small apartment or a gigabit-plus connection should consider a single router.
Pros and cons
- Three units cover a large home
- Gigabit ports on each unit
- Works with Alexa
- Access point mode
- Wi-Fi 5, not the newest standard
- No multi-gig ports
- Band details beyond dual-band not given
Performance notes
Each unit relays traffic to the others over its radios, so signal strength at the edges depends on where the units are placed. Placing units within range of one another matters more than counting rooms.
Specifications
| Brand | TP-Link |
|---|---|
| Model | Deco S4(3-Pack) |
| Dimensions & fit | |
| Lan port bandwidth | 1000 Mbps |
| Item weight | 4.2 pounds |
| Item dimensions l x W x h | 3.57 x 3.57 x 6.39 inches |
| Capacity & performance | |
| Connectivity Range | 5500 square_feet |
| Power & efficiency | |
| Voltage | 12 volts DC |
| Construction & materials | |
| Color | White |
| Compatibility & installation | |
| Connectivity Technology | Ethernet, Wi-Fi |
| Compatible Devices | All WiFi Enabled devices |
| Included components | |
| Number Of Packs | 3 |
| Warranty & support | |
| Warranty description | 2 year manufacturer |
| Other details | |
| Data transfer rate | 1200 Mbps |
| Wi-Fi generation | Wi-Fi 5 (802.11ac) |
| Frequency band class | Dual-band |
| Maximum upstream data transfer rate | 950 Mbps |
| Security protocol | WPS |
| Number of antennas | 9 |
| Antenna type | Internal |
| Coverage | 5500 square feet |
| Builtin media | 3 Deco units, 1 RJ45 Ethernet cable, 3 power adapters, quick installation guide |
| Control method | Voice, Alexa |
| Antenna Location | Home |
| Controller Type | amazon_alexa, vera |
| Frequency | 5 GHz |
| Operating System | Linux |
| Other Special Features Of The Product | Access Point Mode |
Closest rivals on specs
AmpliFi HD AFI-HD Mesh WiFi System- Maximum upstream data transfer rate 950 vs 1300 Mbps (-27%)
- Number of ports 6 vs 4 (+50%)
Google Wifi AC1200 Mesh WiFi System 3 Pack- Number of ports 6 vs 3 (+100%)
- Warranty description 2 vs 1 years (+100%)
Google Nest WiFi Pro 6E Mesh System 3 Pack- Data transfer rate 1200 vs 1000 Mbps (+20%)
- Number of ports 6 vs 4 (+50%)
- Warranty description 2 vs 1 years (+100%)
Frequently asked questions
How do I move or add TP-Link Deco units?
The description says all TP-Link Deco mesh units can work together, so units can be paired. The listing gives no moving steps.
What is in the TP-Link Deco S4 3-pack box?
Three Deco units, one RJ45 Ethernet cable, three power adapters and a quick installation guide.
Does the TP-Link Deco S4 work with Alexa?
Yes. The title says it works with Alexa.
Can the TP-Link Deco S4 replace my router?
Yes. The title says it replaces a Wi-Fi router and extender, and any unit can work as a router.