Adafruit Gemma Sensor Starter Pack Shipping:2-4 Weeks This version is the 4mm

This version is the 4mm pitch 64x32 RGB LED Matrix

* Wattage: 60W

Here is the Arduino-based CO2 sensor designed by DFRobot lovely engineer

With the help of an iBeacon

The battery has overcharge and short circuit protection

Adafruit Gemma Sensor Starter Pack Shipping:2-4 Weeks This version is the 4mmGo interactive with sensors and Adafruit GEMMA with this lovely starter kit! Included is everything you need to make a basic sensing project (or two). There's a GEMMA board, four sewable bright RGB pixels, a motion sensor, a switch, a light sensor, a piezo, a rechargeable battery and charger, 2 ply conductive thread, alligator clips to help you test out your circuit, and a USB cable for programming GEMMA. Gemma Sensor Pack contents: Adafruit Micro