Waterproof magnetic box + 3,500mAh battery. (Tracki GPS tracker https://amzn.to/2Mijobo is NOT INCLUDED) The waterproof box can house the Tracki GPS tracking device with the included extra battery of 3500mAh (replacing the built in of 600mAh) basically 6 times battery life (up to 21 days) The box is very strong, has a very strong magnet attached to it and also special slots (can be seen beside the magnet) to hook it to farm animal belt, cargo, shipments, boat engine or expensive mobile construction equipment. If tracking once an hour or once a day is frequent enough, Tracki has a special new software that can make the 3500mAH battery lasts up to 12 months. Can also set for more frequent tracking during daytime and less frequent at night. (this software is currently available only for Tracki 3G Tracking Device) Notes: 1. This item is for the box + battery only. GPS tracker is not included. 2. This item will only fit our Tracki GPS tracking device https://amzn.to/2Mijobo * Battery life will depend on: Ping rate and cell signal strength * Specifications Item Dimension: 63mm x 58.5mm x 42.5mm Item Weight: 150g Battery: 3500mAh Li-Ion Battery (up to 21 days) Product Warranty: 1 Year What's in the box Waterproof box with magnet Power Pack 3500mAh battery. (Tracki GPS tracker is NOT INCLUDED in this product)