The 3500NCP labeled the Super-X because of the X-tra features, X-ceptional range and is designed for X-treme training situations! 

Features:

• Precise stimulation level (0-127)
• 1 mile range
• 'Nick', 'Constant' and non-stimulating pager/vibration
• 2-hour rapid charge Lithium Polymer batteries
• Fully waterproof collar/receiver and transmitter
• LCD screen displays exact level of stimulation even in dark or low light conditions
• Regular/mild setting toggle switch, gives you the option to adjust the range of stimulation levels for your dog's sensitivity
• Three bar battery life indicator

Package Contents:

• Transmitter
• Receiver (two collar receivers for dogtra two-dog models)
• Lithium Polymer Battery charger and splitter cable
• Test light
• Owner's manual
• Carrying case