SportDog Tek 1.5 GPS CollarUSED some wear and tear but still works see pics The SportDOG Brand TEK Series 1. 5 GPS Tracking System upgrades our original tracking systems Handheld Device making it compatible with the TEK Series 2. 0 Collar Receiver that features a more compact design and even better tracking reliability. By using our HopTek technology, the Collar Receiver reports the location, direction, and status of up to 12 dogs in a 7 mile range, all viewable on the Handheld