Newly updated Dogtra 1900S HANDSFREE PLUS e-collar now features 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 complete waterproof remote training e-collar system is ideal for large dogs 35 pounds and up. 1900S HANDSFREE PLUS E-Collar Features: HANDSFREE Dog Training Square Bluetooth Technology Training Functions: Nick, Continuous, HPP Vibration & Boost-NEW! Safety Level Lock-NEW! 127 Level High Output for Large Dogs 35 lbs+ ¾ Mile Long Range Dog Remote Collar Training 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 With comfort and safety in mind, the ¾-mile range 1900S HANDSFREE PLUS is IPX9K waterproof certified making it durable and reliable for demanding training conditions. In addition to the easy hands-free access, the 1900S HANDSFREE PLUS also offers 127 stimulation levels to choose from for accurate control, HPP (High Performance Pager) vibration, and an ergonomic receiver shaped to the dog’s neck.