The Laptop Defender from Doberman Security! Attach it to your laptop, set your code and it is armed and ready! Simply put, there is no easier way to protect your laptop from theft. Its blinking light tells all around you that your computer is being protected by The Laptop Defender. The Laptop Defender is lightweight and no bigger than a credit card. There are no bulky wires or chains to lug around. Your computer is wireless. There's no reason your laptop security shouldn't be as well. The Laptop Defender doesn't even need batteries. Just plug it into your USB port and it will recharge itself.