DT Systems H2O 1850 Plus Add On Training Receiver Collar: * Can be added to any existing H2O 1850 Plus series training system (excluding Bbeeper models) to expand your unit up to a 2-dog system * Can also replace a lost or damaged collar for all H2O 1850 and 1850 Plus series systems * Beeper/locator has 3 functions: locate, run and point mode, and point only mode * Audible from up to 450 yds away * Fast and simple programming into your system * Digital technology * Up to 1800 yd (1 mi) range * Lightweight and waterproof * MAXX-Range Internal Antenna System * Rechargeable Ni-MH batteries * Built-in safety shut off system * Includes 1 collar unit with a collar belt * Limited lifetime warranty