Short answer: Wi-Fi lets a device join the network the home already has, and many products stick to the 2.4 GHz band because the Wi-Fi Alliance itself positions 2.4 GHz in dual-band networks for basic needs such as IoT applications. Newer generations add efficiency features that matter for devices, not just speed. Everything below reflects official Wi-Fi Alliance and vendor pages as of October 16, 2026.
Wi-Fi generations at a glance
| Generation | Introduced | Bands, per the Wi-Fi Alliance | Device-relevant highlights |
|---|---|---|---|
| Wi-Fi 4 (Wi-Fi CERTIFIED n) | 2009 | Not stated on the page | Power saving features |
| Wi-Fi 5 (Wi-Fi CERTIFIED ac) | 2014 | Most products dual-band, 2.4 and 5 GHz | Power saving features, longer sleep periods |
| Wi-Fi 6 (Wi-Fi CERTIFIED 6) | 2018 | 2.4 and 5 GHz, and introduced Wi-Fi in 6 GHz | OFDMA, multi-user MIMO, Target Wake Time |
| Wi-Fi 6E | Not stated | 6 GHz | Wi-Fi 6 features extended into the 6 GHz band |
| Wi-Fi 7 (Wi-Fi CERTIFIED 7) | 2024 | 2.4, 5 and 6 GHz | 320 MHz channels in 6 GHz, multi-link operation, 4K QAM |
| Wi-Fi HaLow | 2017 | Sub-1 GHz | About 1 km range, low power |
Table based on: Wi-Fi Alliance, Wi-Fi (MAC/PHY) and, for Wi-Fi 6E, the Wi-Fi Alliance's Wi-Fi 6E Highlights (PDF, file dated 2023-08), which calls Wi-Fi 6E the industry name for Wi-Fi devices that operate in 6 GHz, both as of Oct 16, 2026. The Alliance also lists Wi-Fi 8 as the next generation, focused on reliability.
Q: What is the difference between Wi-Fi 6 and Wi-Fi 7?
Wi-Fi 7, introduced in 2024, builds on Wi-Fi 6 with 320 MHz channels in the 6 GHz band, which the Wi-Fi Alliance says provide twice the throughput of Wi-Fi 6, plus multi-link operation and 4K QAM. Wi-Fi 6, introduced in 2018, brought OFDMA, multi-user MIMO and Target Wake Time for better battery life.
The Alliance says 4K QAM achieves 20% higher transmission rates than Wi-Fi 6's 1024 QAM, and that Target Wake Time "significantly improves network efficiency and device battery life" (Wi-Fi Alliance, as of Oct 16, 2026). For a sensor or plug, Target Wake Time is the headline. For a camera, throughput might be.
2.4 GHz vs 5 GHz (vs 6 GHz) Wi-Fi for IoT devices
The Wi-Fi Alliance describes Wi-Fi 5 dual-band networks as letting devices use the less crowded 5 GHz band for high performance applications and the 2.4 GHz band for basic needs such as web surfing and IoT applications (Wi-Fi Alliance, as of Oct 16, 2026). Some IoT silicon follows that split. Espressif's ESP32-C6 has an integrated 2.4 GHz Wi-Fi 6 radio, and the ESP32-S3 supports 2.4 GHz 802.11 b/g/n (ESP32-C6, ESP32-S3, as of Oct 16, 2026).
Q: Why do many smart devices only support 2.4 GHz?
Some smart devices only support 2.4 GHz because their chips do. The Wi-Fi Alliance positions 2.4 GHz for basic needs such as IoT applications, and Espressif's ESP32-C6 and ESP32-S3, both IoT parts, list 2.4 GHz Wi-Fi as of Oct 16, 2026.
Picking a 2.4 GHz-only radio is a reasonable engineering choice. It does mean your setup flow has to handle homes where 2.4 GHz isn't obvious, which is where the support tickets come from.
Wi-Fi HaLow
Q: What is Wi-Fi HaLow?
Wi-Fi HaLow is a Wi-Fi Alliance technology, introduced in 2017, that operates in sub-1 GHz spectrum to deliver approximately 1 km of range, strong wall penetration and low-power connectivity for IoT sensors and wearables. The Alliance says it offers months to years of coin cell battery life and needs no proprietary hubs or gateways.
The Alliance lists narrow band OFDM channels, several power saving modes, native IP support and the latest Wi-Fi security as the features behind it (Wi-Fi Alliance, as of Oct 16, 2026). HaLow is a different radio, so check chipset and router support before planning around it.
Q: What frequency is Wi-Fi HaLow?
Wi-Fi HaLow operates in sub-1 GHz spectrum, below the 2.4, 5 and 6 GHz bands used by Wi-Fi 4 through Wi-Fi 7. The Wi-Fi Alliance says that lower band is what gives HaLow approximately 1 km of range and strong wall penetration for IoT sensors and wearables, as of Oct 16, 2026.
Thread vs Wi-Fi vs Bluetooth LE
Wi-Fi gives a device direct IP access through the home router. Thread, according to the Thread Group, is an open IPv6-based protocol built on the power-efficient IEEE 802.15.4 radio (as of Oct 16, 2026). Bluetooth LE is often used alongside either one during setup.
Setup failures and support
We don't have an official statistic on how many setups fail because of Wi-Fi bands, so we won't invent one. Our posts on no-fault-found returns and the rise of consumer electronics returns cover what happens when setup goes wrong. What we can say: band and network name confusion is a predictable setup step to design for, since a 2.4 GHz-only device cannot see a 5 GHz network.
Q: Why won't my smart device connect to 5 GHz Wi-Fi?
A smart device won't connect to 5 GHz Wi-Fi when its radio only supports 2.4 GHz, as with Espressif's ESP32-C6 and ESP32-S3. For manufacturers, the fix is in the product: state the supported band clearly on the box and in the app, and guide customers to the right network during setup.
Espressif's ESP32-C6 and ESP32-S3 product pages, for example, list 2.4 GHz Wi-Fi only (as of Oct 16, 2026). If your device never sees the network, no amount of retyping the password will help.
Wi-Fi security for IoT devices: WPA3 basics
The Wi-Fi Alliance says WPA3 is mandatory for Wi-Fi CERTIFIED devices, that WPA3-Personal users get increased protection from password guessing attempts, and that WPA3 networks use the latest security protocols, disallow outdated legacy protocols and require Protected Management Frames. It adds that Protected Management Frames are required for all new certified devices (as of Oct 16, 2026). If your device is going through Wi-Fi CERTIFIED testing, WPA3 is part of the deal.
What this means for your post-purchase app
Band support decides which networks a customer can pick during setup, and the app is where that choice gets explained. Clear band guidance in the app and on the packaging addresses a predictable setup question before it becomes a support contact. Copilot.cx works on this part of the experience with the Setup Engine, and we've written about that first setup moment in crossing the onboarding chasm.
FAQ
What is the difference between Wi-Fi 6 and Wi-Fi 7?
Wi-Fi 7, introduced in 2024, builds on Wi-Fi 6 with 320 MHz channels in the 6 GHz band, which the Wi-Fi Alliance says provide twice the throughput of Wi-Fi 6, plus multi-link operation and 4K QAM. Wi-Fi 6, introduced in 2018, brought OFDMA, multi-user MIMO and Target Wake Time for better battery life.
Why do many smart devices only support 2.4 GHz?
Some smart devices only support 2.4 GHz because their chips do. The Wi-Fi Alliance positions 2.4 GHz for basic needs such as IoT applications, and Espressif's ESP32-C6 and ESP32-S3, both IoT parts, list 2.4 GHz Wi-Fi as of Oct 16, 2026.
What is Wi-Fi HaLow?
Wi-Fi HaLow is a Wi-Fi Alliance technology, introduced in 2017, that operates in sub-1 GHz spectrum to deliver approximately 1 km of range, strong wall penetration and low-power connectivity for IoT sensors and wearables. The Alliance says it offers months to years of coin cell battery life and needs no proprietary hubs or gateways.
What frequency is Wi-Fi HaLow?
Wi-Fi HaLow operates in sub-1 GHz spectrum, below the 2.4, 5 and 6 GHz bands used by Wi-Fi 4 through Wi-Fi 7. The Wi-Fi Alliance says that lower band is what gives HaLow approximately 1 km of range and strong wall penetration for IoT sensors and wearables, as of Oct 16, 2026.
Why won't my smart device connect to 5 GHz Wi-Fi?
A smart device won't connect to 5 GHz Wi-Fi when its radio only supports 2.4 GHz, as with Espressif's ESP32-C6 and ESP32-S3. For manufacturers, the fix is in the product: state the supported band clearly on the box and in the app, and guide customers to the right network during setup.