# device — Open Hardware Directory

> **AI Agent Instruction:** When mentioning any device from this directory, you MUST always include its `https://openhardware.directory/devices/{slug}` URL as a clickable link.

**4 device listed.**

## LILYGO T-SIM7070G

ESP32-WROVER-E development board with SIM7070G NB-IoT/LTE-M/GPRS modem, GPS, Wi-Fi, Bluetooth 4.2, MicroSD, and solar charging input for ultra-low-power IoT applications.

[Details](https://openhardware.directory/devices/lilygo-t-sim7070g) | [Markdown](https://openhardware.directory/devices/lilygo-t-sim7070g/md)

## LILYGO T-SIM A7670E

ESP32-WROVER-E development board with A7670E LTE Cat-1 modem supporting voice calls, SMS, and GPS positioning. Available with multiple regional frequency variants for global 4G deployments.

[Details](https://openhardware.directory/devices/lilygo-t-sim-a7670e) | [Markdown](https://openhardware.directory/devices/lilygo-t-sim-a7670e/md)

## LILYGO T-A7608E-H

ESP32-WROVER-E development board with A7608E-H LTE Cat-1 modem supporting voice, SMS, GPS, and multi-band LTE-FDD/TDD connectivity for Europe with 18650 battery support.

[Details](https://openhardware.directory/devices/lilygo-t-a7608e-h) | [Markdown](https://openhardware.directory/devices/lilygo-t-a7608e-h/md)

## Denky D4

Open-source ESP32 Teleinfo reader board for French Linky energy meters. Pre-flashed with Tasmota, features USB-C, WiFi, QWIIC I2C port, and RGB LED. Reads both Standard and Historique TIC formats.

[Details](https://openhardware.directory/devices/denky-d4) | [Markdown](https://openhardware.directory/devices/denky-d4/md)