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. ARC HANDSFREE PLUS E-Collar Features: Expandable E-Collar up to 2-Dogs HANDSFREE Dog Training Square Bluetooth Technology Training Functions: Nick, Continuous, Vibration & Boost-NEW! Safety Level Lock-NEW! 127 Level Medium Output for Small, Medium & Large Dogs 15 lbs+ ¾ Mile Long Range Dog Remote Collar Training Slim Lightweight Ergonomic Curved Collar Fully Waterproof E-Collar IPX9K System Handsfree Training Square: Dog owners can now train without having to reach down for their remote. Each training square can be paired to different functions: Nick, Continuous, Vibration & BOOST Pair up to 14 TRAINING SQUARES to your remote Square must be 33 feet of the remote to operate 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.