Here is some additional info from Secure Outdoors about their product: Secure Outdoors supplies wireless tracking devices that are designed to locate and communicate vital information about the asset or package in places where other devices simply cannot work. Secure Outdoors products are designed for end users who “Must Find” and know the status of their valuable asset. As a result, we annually save our customer’s hundreds of thousands of dollars in loss prevention and loss recovery and best part is the MT300 can be used on one asset to the next.