At Black Hat Asia security conference in March, security researchers Javier Vazquez-Vidal and Alberto Garcia Illera will be presenting a device – about the size of a mobile phone – that allows an attacker to take over an automobile.

The researchers have named it the ‘CAN Hacking Tool,’ or CHT, according to a Forbes report, which adds the device can be built for less than $20.

The CHT device has to be physically attached to the car’s internal network in order to work, but the researchers said it takes about five minutes to rig up and will result in the attacker being able to issue malicious commands to affect steering, brakes, windows, headlights, and more.

The device only communicates via short-range Bluetooth for now, but can be assembled from everyday parts.