PetSafe Clik-R Duo Clicker train two dogs at same time with two unique sounds Includes less intimidating chime sound for nervous or sensitive pets Easy to hold with finger loop and/or removable lanyard Uses one 3-volt lithium coin cell battery (included) Call, chat or email with our expert US-based customer care specialists six days a week; they are waiting to assist you and your pet with your product needs PetSafe Brand is an industry leading US manufacturer of pet behavior, containment, and lifestyle products since 1991, helping millions of people and pets each year Dual sounds, click and chime, for a variety of training uses Less percussive chime sound for nervous or sensitive pets Uses one 3-volt lithium coin cell battery (included) New packaging, same great product