LightBlue Bean is an Arduino-compatible board that is programmed wirelessly using Bluetooth Low Energy.
It can be programmed from your favorite platforms: OS X, Windows, iOS and Android. The Bean+ comes with an on-board accelerometer and temperature sensor.
It has a 600 mAh rechargeable battery, running for over a year on one charge. The added micro-USB port allows you to charge it.
The project campaign is on the Kickstarter and already has reached its funding goal of $30.000, the early bird pricing are gone, but you can still get it for $39, an estimated delivery is on December of 2015.