The night tracking light can be set to flashing or solid which is especially convenient when using it in a 2-dog system. The Educator will turn a smart stubborn dog into a genius. Proudly assembled in the USA. Professional Remote Dog Training Collar - The ET-400 dog training E-collar has 100 adjustable levels of correction, vibration, and tone for Pavlovian conditioning. The 3/4 mile range is ideal for walking in parks, hunting & field training.Safety First - Unique safety lock-and-set feature safeguards against accidental stimulation level changes. The dog training collar comes with a built-in LED light for nighttime visibility. Smarter Ways to Train Your Dog - Our professional electric dog collar for medium and large dogs comes with a 33" long by 3/4" wide bungee strap for added elasticity and comfort. Fits dogs 10+ lbs with necks 9" - 25". Unique Features - Unlike other remote dog trainer collars, our remote transmitter and electronic dog collar are both waterproof, and the remote even floats in the water.