1000 Meters 4 in 1 Rechargeable Wireless Remote Dog Training Collar &ndash;3 Levels of Intensity: Shock, Vibration and Sounds -Blue Backlight Screen -Remote Transmitter Corrections Best Electronic Training Collars for Large, Medium and Small Dogs Up to 1000 meters (1093 yards), 3 Levels of Intensity: Shock, Vibration and Sounds Comfortable waterproof collar, LED signal, beep signal 3 Modes: Vibration, Shock and Sound. 8 levels for adjustment Easy to operate and read the modes and levels on the remote at dark environments. One second press on the menu button wakes it up from sleep mode. Shock function on this collar is suitable for medium and large dogs.