There is an anti-theft lock jack du (Kensington Lock) on the notebook. You need to buy an anti-theft lock chain, one end is inserted into the zhi, and the other end is fixed on a large, non-moving object. This is to prevent the notebook from being accidentally Mobile.Small Brass Key Locks ManufacturersProceed as follows:Wind the kensington lock cable around a large stationary object such as a chair or table.Pass the end of the cable with the anti-theft lock through the looped end of the kensington lock cable.Insert the anti-theft lock device into the kensington lock hole on the product.Lock the anti-theft lock and that's it.