This MotorAir - Bluetooth Dual Motor Driver Smartphone Remote Control Kit includes a USB dual motor driver board and a Bluetooth Bee module, which means you can control your DC motors by Bluetooth. It allows to control two DC motors by using the USB port of your computer! It has a wireless extension port, so you could also change the Bluetooth module for a XBEE or WiFiBee module!
The MotorAir board can be powered by USB bus or DC power and provides two motor driver ports can drive up to 2 amps per channel. You can control two DC 5-24V motors forward or backward. You can control the motor speed.