W2O (WiTilt to OSC) is a data processor, running on Mac OS X, for use with the Wireless Accelerometer / Tilt Sensor version 2 by Sparkfun. More specifically, W2O is a combination of a Bluetooth data server and an Open Sound Control client.

3-D tilt / accelerometer measurement data transmitted from the WiTilt v.2 sensor is received via Bluetooth, packaged into customizable OSC messages, and then sent out to any destination over network through UDP.

This thing is small:
Carrier board : 1.5x2" (38x51mm)
Overall height fully populated : 0.275" (7mm)
Overall height slim population : 0.145" (3.7mm)