The ET-400 Educator is a 3/4 mile remote trainer that employs our proprietary "blunt" stimulation making it the most humane and effective dog training collar available. Loaded with unique features, including "lock and set" stimulation levels from 1 to 100, and the ability to set a boost level from 1 to 60, the Educator allows the user to tailor the stimulation to your dog's temperament. The small 2.4 ounce receiver provides plenty of stimulation for most dogs large and small. Alternate stimulation options include vibration and tone. The night tracking light can be set to flashing or solid which is especially convenient when using it in a 2-dog system. 100% Satisfaction Guaranteed. Proudly assembled in the USA.