CovertBand tracking system hijacks smart devices to record

Smart devices such as Google Home and Amazon Echo could be transformed into surveillance tools that track your every move, according to scientists. The CovertBand tracking system uses the built-in microphone as a receiver to pick up reflected sound waves - and is so powerful it can record what you're doing through a wall. The smart device then transmits this information to the attacker, who could be a few feet away or halfway across the globe. The researchers tested CovertBand using a Samsung Galaxy S4 smartphone hooked up to a portable speaker (pictured). Using a software code called CovertBand researchers turned a smart device into a sonar system which can take over built-in microphones and speakers in a smart device - that can be controlled remotely.