Door detecting tracker JT301A is usually installed inside containers with easy installation with tape. It mainly help to monitor the cargo container location, and monitor door open and close, with highly reliability. When someone open the door in a normal cargo unloading, the owner shall be informed. And if someone try to tamper the door and open it to stole the cargo, the alarm shall be triggered immediately before their realize this is a tracker.

It can be rechargeable easily by the USB port, and every 2hours, support 3 months continously working.

Of course, each clients have their own requirement and unique background, we don't know whether it can satisfy you or not without knowing your requirement and application, please catch me for a short discussion to find out whether we're the good match.