In addition to nick, vibration and continuous settings, the 2430 has innovative jump and rise stimulation for greater training versatility. Jump feature allows you to instantly jump to a predetermined intensity level. Rise setting gradually increases stimulation level as you hold down the button until you find the appropriate level for your dog. Includes lightweight, waterproof collar and waterproof transmitter with backlit LCD. 1.3-mile range with antenna woven into collar. The 50 levels of stimulation intensity are adjustable from the transmitter. Adjustable for low-level positive stimulation and built-in safety shut-off system. Powered by rechargeable ni-mh batteries. The 2430 model is a beeper/training unit allowing you to control beeper modes and on/off function of beeper from your transmitter. Collars