E-collar that features 3/4 mile range (1320 yards) and can be used to train 6 dogs with the same handheld remote with purchase of additional Add-A-Dog Collars (SDR-A); Collar Receiver fits dogs 8 pounds or larger with neck sizes 5" - 22" Handheld Transmitter features an easy-to-read OLED screen where you can view the selected dog, static level, and mode, as well as battery status Both the Handheld Transmitter and Collar Receiver feature our DryTek technology, making them waterproof and submersible to 25 feet Rechargeable lithium-ion batteries last 40 - 60 hours in the Remote Transmitter and 140 - 160 hours in the Collar Receiver per charge; they both feature a low battery indicator and can be charged at the same time using the included split-end charger Handheld Transmitter button functions can be customized; Detailed operating guide, training DVD, and a locally based Customer Care Center, reachable at 844-209-4636, provide support when you need it By designing our products in the field, with heat, cold, rain, snow, dust, mud, and wind in mind, SportDOG Brand has become one of the most recognized brands in the electronic tracking and training categories, making the promise to create "Gear The Way You'd Design It"