Technology, no matter how smart, only works if you use it, or simply remember to turn it on.

To ensure accountability during police encounters, Axon, Taser’s police body camera division, has announced a small sensor for gun holsters that can detect when a gun is drawn and automatically activate all nearby cameras. The sensor, Signal Sidearm, is part of a suite of products aimed at reducing the possibility that officers will fail to or forget to switch on their cameras during encounters with the public. Last year in Chicago for instance, an officer, when giving chase, said he forgot to turn on his camera before fatally shooting an unarmed 18-year-old named Paul O’Neal.

Taser also sells sensors that activate the company’s body cameras and dashboard cameras when a police cruiser’s door has opened or its lights have been switched on, as well as a battery pack for the Taser electroshock weapon that prompts cameras to record when the weapon is armed. By activating all cameras within a 30-foot radius, the suite of products can help police create a multi-angle video of a police encounter. (Taser’s cameras are also equipped with a historical buffer that captures footage up to two minutes prior to a camera’s activation.) Many police dashboard cameras are already designed to activate when the engine is started or a siren is turned on, and another camera maker, Vievu, also sells a holster that automatically triggers its cameras. In the future, body cameras could be activated when an officer enters a hot spot or makes a call on the radio.

“When law enforcement officers must draw a weapon, the last thing they should worry about is their technology,” Rick Smith, Taser’s CEO and cofounder, said in a statement. “The Signal Sidearm will give officers the same confidence in their technology that already exists in encounters involving Smart Weapons that use our Signal technology. It’s an important step in extending the reach of the Axon network to connect other devices.”

Axon Signal Sidearm by TASER International, Inc.

A number of police departments have already begun to deploy the suite of sensors, called Axon Signal, which Taser markets as part of a brisk business selling services as well as products to police departments. In an earnings report released today, Taser said its revenues from body cameras increased 154% to $23.7 million in the fourth quarter of 2016, compared to $9.4 million in the fourth quarter of 2015, far outpacing the growth of its weapons sales. Roughly 6,000 of the 18,000 law-enforcement agencies in the U.S. are thought to be using body cameras in some form, and some estimates put the the market for body cameras and services at $1 billion a year.

It’s a fierce business, too. The Signal ecosystem is currently the subject of a lawsuit by police camera company Digital Ally, which claims that Taser is infringing Digital’s patents on a similar technology. Taser has called the suit frivolous.

Taser’s holster sensor is scheduled for release later this year, but the company has not said how much it would cost. Last year, according to a Taser price list, a standard Axon Flex camera equipped with Signal cost $688, and a basic 1-year subscription to Evidence.com with 100 GB of cloud storage cost about $150 per officer.