This entry-level Dogtra Element 1/2 Mile Remote Trainer sporting unit with low to medium power features an easy to use, ergonomic water resistant transmitter. The Dogtra Element 1/2 Mile Remote Trainer has a rheostat dial which allows for a gradual increase in stimulation intensity with no jumps between levels. The Dogtra Element 1/2 Mile Remote Trainer is ideal for mild mannered to medium disposition dogs. The receiver collar is waterproof with a 1/2 mile range. No external antenna on the collar receiver. Plus, the Dogtra Element 1/2 Mile Remote Trainer comes with rechargeable Ni-MH Batteries with a one-charger system that allows the transmitter and receiver(s) to be charged at the same time. The Dogtra Element 1/2 Mile Remote Trainer has over 3000 different identity codes to prevent conflicts with other e-collars. Not intended for use on dogs weighing less than 12 pounds or under 6 months of age. The collar strap measures 3/4" width x 29" length. Pet Street Mall has the Lowest Prices and offers Free Shipping on all orders over $50.