The GPS transmitter contains magnets inside, allowing you to attach the mini GPS tracker to any iron object. This GPS tracker is designed for important documents such as wallets, purses, bags, children's school bags, strollers, bicycles, motorcycles, cars, trucks, boats, vans, and anti-theft construction equipment. Its mini design and black casing make it easy to conceal. Implement tracking to protect your loved ones; suitable for cars, suitcases, children, the elderly, etc. The GPS tracker has built-in magnets and is very easy to install. The casing is water-resistant. The tracking service allows you to locate the vehicle even when it is underground without a GPS signal. It sends an alert to your mobile phone if the vehicle is outside the set area.