Newly updated Dogtra ARC HANDSFREE PLUS expandable slim ecollar now with Boost & Safety Level Lock. Train with the convenient HANDSFREE SQUARE, which allows dog owners to easily train without having to reach for the remote. This lightweight complete waterproof expandable remote training e-collar system is ideal for training small, medium and large dogs 15 pounds and up. The ¾-mile range ARC HANDSFREE PLUS is slim lightweight IPX9K waterproof remote collar making it durable and reliable for demanding training conditions. The system also offers 127 Nick/Constant stimulation levels for precise control and a Pager vibration, making it the perfect tool for your training.