Introducing Walter, which is a small but powerful IoT module with global connectivity and simple integration, based on the ESP32-S3. Walter uses all WiFi, Bluetooth LE, GPS and cellular (NB-IoT and LTE-M) technologies together in a single small cell.
The most interesting peculiarity of Walter is that it is certified to be used globally: CE, FCC, IC, RCM and UKCA. That means it’s ready to go for commercial IoT projects without you having to wait for major region-specific approvals. The module is designed and built in the EU, which adds to its appeal for those looking for long-term availability and quality.
From a software viewpoint, Walter is very friendly: its schematics are open-source under the GPLv3 license. You can program it using Arduino IDE, MicroPython, or native Espressif IDF. That gives both beginners and experienced developers the flexibility to pick their preferred workflow.
On the hardware side, Walter’s form factor is just 55 mm × 24.8 mm despite packing all those features, WiFi, BLE, GPS, NB-IoT/LTE-M modem and the ESP32-S3 microcontroller. All I/O pins are accessible, and none are reserved as strap pins, which means you get layout freedom when designing your board. For power-sensitive applications, Walter shines too: it uses an ultra-efficient DC-DC converter and can drop to as low as 9.8 µA in deep sleep when the modem is in PSM (power-saving mode).
This module is ideal for IoT applications where you need wide-area connectivity (NB-IoT, LTE-M), WiFi/Bluetooth local connectivity, GPS positioning, and flexible I/O, all wrapped up in a production-ready, certified package. Whether you’re prototyping or building for production, Walter reduces a lot of the hard parts: certification, global connectivity, and hardware/software stack.
Right now, the Walter ESP32-S3 IoT module costs €59 for the bare unit on the official QuickSpot website, with the “Walter Feels” carrier board at €125 and the full dev kit at €250 (all ex-VAT). It’s available for international orders, though some listings show shipping as late as December 2025 for backordered stock. Distributors like Mouser and Crowd Supply also sell it, including to India, but official INR pricing isn’t provided. When importing, the final cost increases due to GST, customs, and shipping, putting the base module at roughly ₹5,400–₹6,000 before extra fees. Volume pricing is available for larger orders.
Sayantan Nandy