Waterproof Function – This dog training collar receiver is 100% waterproof/submersible and can handle any wet environment your dog decides to jump into! Be it a lake, pond or your swimming pool, this receiver can handle it all. Convenient Design - Both transmitter and collar receiver can be charged at the same time. Easy-to-read Backlit LCD screen shows the stimulation level, making it extremely ideal for low light conditions. Intelligent Control - Sound & Vibration Modes.