DogMaster Trainers carry the best Garmin GPS dog tracking systems. The Alpha 100 handheld has built in 3 inch touch screen and rechargeable. The Astro 430 is easy to use with big button designed. The T5 is standard GPS dog tracking collar for dogs from 15kg. The T5 mini suits smaller pet dogs from 7kg. The TT15 is tracking and training collar which works with Alpha 100 handheld only with training function. The TT15 mini is the smaller version of TT15 collar. All the Garmin tracking system are made for outdoor use with waterproof design.