Magnetic Mount Case With Extended 6 Month Battery Compatible with: GL200, GL300, GL300MA, GL300VC, GL300W Rechargeable Extended Battery with Battery Charger Included. Extended battery will add months of live tracking on a single charge. Magnetic Weatherproof Case - Provides FIRM Magnetic Mount which is the key to knowing the Spy Spot Extended Battery will remain securely attached. Designed and Engineered to be placed under any vehicle. Simply place on any Flat Metal Surface. Magnet is rated 50lbs. The reinforced magnet will not break off. The Sturdy Waterproof design is perfect for long term GPS tracking, suitable for use on outdoor moving vehicles while keeping the interior safe from moisture and corrosion. This gives you the ability to deploy it anywhere - even in the harshest weather conditions Very compact: 5.43 x 4.06 x 2.5 Inside Dimensions: 4.5" x 3" x 1.5"