Includes 2 devices per package [The backlit images are of the ZphiB SHIELD]. * Wireless—no drilling into the vehicle, super quick installation. No harm done to your vehicle. * Battery Operated —requires 3 AAA batteries per device (batteries not included). * Magnet induced or Button controlled—you control when the light is activated. A sensor is located on bottom, so you can choose if you want to turn it on or off. The manual power button is located on the top. * LED Light Source—longer range and brighter than the normal incandescent light; extra vivid at night.