From the Manufacturer:
The ET-300 Mini Educator 1/2 mile remote trainer employs our proprietary "blunt" stimulation for humane and effective remote dog training. 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 ET300 Collar allows the user to tailor the stimulation to their dog's temperament. The smaller transmitter is especially well-suited for smaller hands or situations where discreetness is important. The small 2.4-ounce receiver provides plenty of stimulation for large and small dogs. Alternate stimulation options include tone and vibration remote training. The night tracking light can be set to flashing or solid which is especially convenient when using it in a 2-dog system. The ET300 Collar Mini Educator will turn a smart, stubborn dog into a genius. 100% Satisfaction Guaranteed. Proudly assembled in the USA.
THIS IS A NON-RETURNABLE PRODUCT
Manufacturer's warranty info can be found here: https://www.ecollar.com/pages/warranty-returns-and-cancellation