The DT Systems H2O 1812 Dog Training Collar has all of the features and superior quality you've come to know with DT Systems. This two dog system allows you to train two dogs with one transmitter. It features both waterproof collars and a transmitter, rechargeable NiMH batteries in both the transmitter and receiver, and DT's MAXX Range TM Internal Antenna System. The H2O 1812 has 16 adjustable levels of momentary and continuous stimulation. DT Systems H2O 1812 Dog Training Collar Features: Two Dog System (includes two collars) 1 mile range Waterproof collar & transmitter Nick & constant 16 stimulations levels MAXX Range TM Internal Antenna Domestic U.S. charger with double jack cable for simultaneous charging included Carrying case included Premium Lifetime Warranty DT Systems Premium Lifetime Warranty is the best warranty offered in the industry. This warranty is free to participating customers. This changes their normal one year parts and labor warranty to a lifetime warranty against manufacturing defects on parts and a one year warrant on labor. What is covered DT Systems Premium Lifetime Warranty covers all parts to be manufacturer free from defects for as long as the original purchaser owns the product. (Batteries are not included in lifetime warranty). What is not covered Batteries are not part of their lifetime warranty, but are warrantied against manufacturer defects for one year from the original purchase date. Their warranty does not cover parts that malfunction due to misuse, abuse from improper maintenance or incorrect handling. Damage from dogs chewing or wear and tear from excessive field use is not covered. How the lifetime warranty works DT Systems will replace the manufactured defective part for participating customers only who have mailed in their warranty card with completed registration information. There is no charge for parts or labor for the first year on any of our lifetime warranty products. When the product's labor warranty expires after the first year, there will be a normal labor charge for any repair under the lifetime warranty program should your system be in need of service. Any manufactured defective part or parts that need replacement will be free during the lifetime warranty period. If you have had your system for one year or longer, please call or fax our customer service department at 214-350-9446 or fax 214-350-7847 to determine the labor charge.