TEK-L Tek Series 1.0 GPS Tracking Collar -T he SportDOG TEK Series 1.0 GPS Tracking Collar allows you to add a dog to your current TEK Series 1.0 unit. Up to 12 dogs can be added for location tracking up to 7 miles away (12 separate collars required). A separate collar is required for each dog added. This collar boasts a minimum of 20 hours of usage on a single charge. Compatible only with TEK Series 1.0 systems. Two-year manufacturer warranty.