Normal Puck.js devices come with a plain white silicone cover, but in many cases you might want something a bit different. This silicone cover replaces the white case that comes with Puck.js.

This is a bright blue cover.  It lets through a small amount of blue and green light, but blocks Puck.js's red, and IR LEDs.

What is Puck.js?

Puck.js is an intelligent Bluetooth button. With the Espruino JavaScript interpreter on its internal ARM microcontroller, software can be uploaded, debugged and modified wirelessly from any modern computer or phone, making development of embedded devices significantly easier. It has built-in sensors, lights, infrared transmitter, GPIO, and can even control other Bluetooth LE devices.