Espruino comes in six flavours, all of which:

• Use JavaScript, supporting Strings, Maps, Objects, and Dynamic Arrays right out of the box!
• Work on Windows, MacOS, Linux, Chromebook and Android
• Are Low power, drawing under 0.1mA in Deep Sleep mode
• Contain an on-chip Real Time Clock
• Are fully Open Source (software, hardware, documentation and tools)
• Have full documentation, and a thriving forum
• Support a huge range of third party hardware, including ESP8266 WiFi, WIZnet Ethernet, and a range of GSM/LTE modems.

Puck.js

• Bluetooth Low Energy
• Software programmable NFC tag
• Red, Green and Blue LEDs, and General purpose button
• Infrared transmitter
• Magnetometer, thermometer, light and battery sensors
• v2: Accelerometer and Magnetometer
• FET for high-power outputs
• 36mm dia, 12.5mm thick case (64mm x 62mm x 16mm in cardboard box)
• Tough Silicone cover and ABS plastic rear with lanyard mount
• 64MHz Cortex M4 processor
• 64kB RAM, 512kB Flash
• 9 GPIO pins (7 on 0.1" pitch)
• Voltage range: 2.0v - 3.6v
• See more technical information

Espruino Bangle.js 2

• 176x176 3 bit color always-on LCD
• Bluetooth Low Energy
• GPS, Heart Rate, Accelerometer, Magnetometer, Altimeter
• Vibration motor
• IP67 Water resistant
• 36mm x 43mm x 12mm watch body, with standard 20mm watch straps
• 64MHz Cortex M4 processor
• 256kB RAM, 1024kB on-chip flash, 8MB External flash
• 200mAh LiPo battery, USB charge cable
• See more technical information

MDBT42Q

• Bluetooth Low Energy
• Red and Green LED, and General purpose button
• 18mm x 28mm x 4mm thick
• 64MHz Cortex M4 processor
• 64kB RAM, 512kB Flash
• 22 GPIO pins (incl 7 analog)
• Voltage range: 2.0v - 16v @ 20uA average
• Available with on-board or external aerial
• Bare pre-programmed module also available
• See more technical information

Espruino Pixl.js

• 128x64 backlit LCD display
• Bluetooth Low Energy
• Arduino footprint (20x GPIO)
• Software programmable NFC tag
• 60mm x 53mm x 15mm, 4x 3mm mounting holes
• 64MHz Cortex M4 processor
• 64kB RAM, 512kB Flash
• Power from CR2032, USB, or Arduino (2.0v - 16v, 0.3mA at idle)
• See more technical information

Espruino Pico

• 33mm x 15mm (1.3in x 0.6in)
• On-board Type A USB
• Red and Green LEDs, General purpose Button
• 84Mhz ARM Cortex M4 processor
• 384kB Flash, 96kB RAM
• 22 GPIO pins: 21 PWM, 9 ADC, 2 USARTs, 3 SPI, 3 I2C
• CE and RoHS certified
• Available with or without soldered pins
• Voltage range: 3.5v - 16v
• See more technical information

Original Espruino

• 54mm x 41mm (2.2in x 1.6in - half business card)
• Micro USB, Micro SD card, JST PHR-2 battery connector
• RGB LEDs, Reset + General purpose Buttons
• 72Mhz ARM Cortex M3 processor
• 256kB Flash, 48kB RAM
• 44 GPIO pins: 26 PWM, 16 ADC, 5 USARTs, 3 SPI, 2 I2C and 2 DACs
• CE and RoHS certified
• Prototype area
• Voltage range: 3.5v - 16v
• See more technical information