The High Tech Pet Products Multi-Function Training Collar Kit for RX-10 Training Collar comes complete with the RX-10 collar, a CRX-10 collar charger, and AC adapter. The collar snaps into the charger station, and an LED light changes color so you know when it's fully charged (it takes about three hours). The RX-10 collar works with all High Tech Pet ultrasonic and radio products. A thin, lightweight design, the collar is fully waterproof and features Pulsed Proportional Stimulus technology that produces loud, clear progressive training tones for easy boundary training. Advanced features include a built-in battery and stimulus tester, plus dual radio receivers for omni-directional reception. Plus, the stimulus probes are made of solid copper to reduce rust and corrosion.