Meet the BlackBolt O-Bolt: a motorized panning head that works with your GoPro, smartphones and digital cameras to let you capture beautiful time-lapse videos. It has 3 panning motions (continuous, swing, stop-n-go) and 3 speeds. The device comes with a rechargeable battery.
The BA20 continuously pans left or right 360 degrees until you are ready to stop filming. It can be mounted onto your camera tripod easily. Not too expensive either.