LILYGO T-Halow P4: An ESP32-P4 HaLow Board in M.2 Form

LILYGO's latest development board takes an unusual shape. The T-Halow P4, detailed by CNX Software on October 23, 2026, squeezes Espressif's ESP32-P4 microcontroller, an ESP32-C6 wireless co-processor and a Wi-Fi HaLow radio onto a card the size of an M.2 2280 SSD. That means makers can slot a long-range camera and gateway brain straight into a custom carrier board, a neat idea for remote monitoring and industrial IoT builds.

• Processors: ESP32-P4 dual-core RISC-V at 400 MHz, plus an ESP32-C6 for Wi-Fi 6, Bluetooth 5 and Thread/Zigbee
• Long range: an 802.11ah Wi-Fi HaLow module rated at 150 Kbps to 32.5 Mbps, with up to 1.2 km line-of-sight range
• Form factor: 80 x 22 mm with an M.2 B-key edge exposing GPIO, I2C, UART, ADC and SD
• Price: $26.57 from LILYGO's China warehouse, $31.07 for a 915 MHz US-warehouse version, or $36.98 on AliExpress

What Is the LILYGO T-Halow P4?

At its heart is the ESP32-P4NRW32X, Espressif's most capable microcontroller to date. The ESP32-P4 runs two RISC-V cores at 400 MHz with AI instruction extensions and a single-precision FPU, plus a low-power core for background tasks. It also includes a 2D pixel processing accelerator and hardware H.264 and JPEG encoding, which CNX says handles video at up to 1080p30.

Memory is 16MB of QSPI NOR flash plus PSRAM. CNX notes a small discrepancy here: LILYGO's GitHub and wiki list 32MB of PSRAM, while the product page says 8MB, so check the listing before you order if memory matters for your project.

The ESP32-P4 has no built-in radio, so LILYGO pairs it with an ESP32-C6-MINI-1U module over SDIO. That adds 2.4 GHz Wi-Fi 6, Bluetooth 5 and 802.15.4 for Zigbee, Thread and Matter, with an external antenna connector.

How Far Can Wi-Fi HaLow Reach?

The headline feature is a Taixin TX-AH Wi-Fi HaLow module. HaLow, or 802.11ah, runs in sub-gigahertz bands, so it trades raw speed for range and wall penetration. LILYGO offers 859-894 MHz and 902-928 MHz versions with channel widths from 1 to 8 MHz, and quotes throughput from 150 Kbps up to 32.5 Mbps with up to 1.2 km of line-of-sight range.

That is plenty for streaming compressed camera footage or sensor data from a barn, a trailhead or the far end of a warehouse yard, without the per-device fees of cellular. If HaLow is new to you, our coverage of an open-source Wi-Fi HaLow mesh network shows what the technology can do at scale.

Why an M.2 Form Factor for an ESP32-P4 Board?

Putting a microcontroller on an M.2 B-key card is a clever compromise. Designers get a ready-made, certified radio and compute block, and they only need to build a simple carrier board with the connectors and power their product needs. The edge connector carries GPIO, I2C, UART, ADC, SD and other ESP32-P4 signals, while the card itself keeps a USB-C port for power and programming plus BOOT, Reset and Failsafe buttons.

The board also exposes a two-lane MIPI CSI connector with OV2710 camera support and a two-lane MIPI DSI connector for a touch display, so a carrier can turn it into a long-range camera node or a local control panel.

Software Support

LILYGO provides examples on GitHub for HaLow communication, camera and display use. They target ESP-IDF 5.4.1 or newer, with the HaLow module driven over SPI for data and UART for AT commands, and a browser-based Web Serial tool for configuring the radio.

For makers who already like the ESP32-P4, as our recent look at the Wireless-Tag ESP32-P4 touch display board showed, the T-Halow P4 adds the one thing that platform lacked: real long-distance reach. Find more boards like it in our mini computers and dev board coverage.

Sources: CNX Software — October 23, 2026; OpenELAB product listing — October 2026.