The High Tech Pet Products Multi-Function Training Collar for X-10 System does it all, working with all High Tech Pet ultrasonic and radio products. An extremely slim, lightweight design, this collar can be used for dog containment only or as the controller for your entire electronic pet care system. The included rechargeable lithium ion battery never needs replacement (charger sold separately), and the collar is fully waterproof. Advanced features like Pulsed Proportional Stimulus technology, clear progressive training tones, a built-in battery and stimulus tester, and omni-directional reception make this a truly state-of-the-art design. Solid copper probes resist rust and corrosion.