The DT Systems 190DT No-Bark Collar is a versatile training device that is designed to prevent excessive barking. It employs a sophisticated micro-processor system that among other things controls the duration of the static correction controls the safety-delay and remembers the last intensity setting used to correct your pet s barking. The 190DT No-Bark collar is fully waterproof which makes this a perfect collar for almost any dog. A nice feature of this particular model is that there is a built in magnet on the collar which means that you will no longer have to worry about losing the small magnets used to turn the device on or off. 9 Levels of correction. Newly redesigned Digital System with Micro-processor. Adjustable Collar fits medium to extra large dogs. Uses standard 9 Volt battery (not included). System delivers 1/2 second corrective stimulation. Automatic four-second safety delay. Built in Magnetic ON/OFF system. Digital Numeric Display shows 9 different intensity levels. Vibration Sensor only picks up vocal cord vibrations reducing unnecessary “shock” from extraneous noises. Data Memory System saves last used intensity setting. Completely Waterproof.