It was drones, drones, and more drones at the 2015 Consumer Electronics Show in Las Vegas this past week.

CES 2015 featured drones of all sizes, from those that could fit in the palm or your hands to others that could fill a small room. And they also featured a variety of sensors and instruments for all sorts of uses, according to a Mashable report.

Behind nets and glass enclosures, exhibitors showcased the flying abilities of their drones — usually the smaller ones. They were a big hit with the crowd, as attendees gathered around the drones even when they weren’t flying.

The drone market has exploded in recent years. The Consumer Electronics Association expects sales to reach $130 million this year, and it could top the $1 billion mark by the end of the decade.

The drones on display are all capable of flying and hovering using remote control, but each one has a unique piece of technology to set them apart from everyone else. The Hubsan X4, for example, is capable of 4G communications, which means someone can use a phone in China to control the drone all the way in the United States.

Some drones were capable of following their owner, such as Trace.com’s Flyr1, which can be trained to a pattern — say, a marking on the back of your shirt — and then allow you to set exactly how far the drone should be away from you and at what angle of flight. This allows you to stream video of your activities to your mobile device. It lasts for up to 40 minutes on battery. The company that makes it envisions athletes using it to monitor their training.