Customize your TT25 Collar. Pick the standard or mini size flex band, pick the standard or extended battery, pick long range or short range antenna, and pick your collar color. This extended battery pack is user-replaceable and allows up to 136 hours using dynamic update rate.  The standard battery pack..

Build Your Own Garmin T20 Tracking Collar. Choose your flex band size (mini or regular), battery pack (standard or extended), and antenna (long or short range)! This extended battery pack is user-replaceable and allows up to 136 hours using dynamic update rate.  The standard battery pack allows up to 68..