If you are looking for a really small bluetooth adapter you can stop looking as I do not think you will find one smaller than this little baby from Brando. It allows a working range more than 10 meters with a 723 Kbps data rate transmission and complies with Bluetooth 1.1 and USB 1.1 specifications – and it works with Mac too. More info inside.

Features:
- Connect Most Bluetooth devices. Support A2DP up to 30Meter
- Enables wireless connectivity between computers and devices
- Enables connectivity to 7 Bluetooth devices at one time
- Enables Wireless Personal Area Network (PAN) connectivity
- Bluetooth 1.1 compliant
- Bluetooth class 2, compatible with Bluetooth class 1
- USB 1.1 compliant
- More than 33 feet wireless networking range
- Up to 723 Kbps data rate
- Super mini and slime size, easy to carry
- Easy to install and use
- Dimension: 14 x 19 x 6mm (approx.)
- Weight: 2g

Requirements:
- Notebook or desktop computers, with 500 Mhz CPU or higher, 256 MB RAM or higher, 50 MB of free hard disk space, and one free USB port
- Mac OS 10.1.4 or later
- Windows ME, 2000, XP, Vista

Package contents:
- Tiny USB Bluetooth V2.0+EDR Adapter
- Driver CD
- User Guide

Price:
- US$24.00

Tiny USB Bluetooth V2.0+EDR Adapter [brando.com.hk]