The antenna is 2” shorter than on previous models and has enhanced range. The transmitter is waterproof and is made of Lexan. Lexan is the same material that is used in bullet proof products. The intensity dial is designed for easy use whether you’re right or left handed or use your thumb or finger to operate the dial. The grip is rubberized. It’s designed for both ease of use and comfort. The toggle switch is located so that it is less likely to snag and the tone button has been moved to the back for quick and easy access. The battery pack is removable so that you can carry a charged spare in your pocket and quickly replace a weak battery. The battery compartment is waterproof. There is a battery life indicator so that you know when it’s time to replace the battery with a fresh one. G2 Receiver Features: The receiver is 1/3 smaller than older models. It’s also made of the same tough Lexan material as the transmitter. The receiver features the same battery charging system as the transmitter. It has a removable, waterproof battery pack and a battery life indicator. The receiver features an extra loop to keep it snug to the collar strap. G2 Charging system: The new charging system is simple and convenient. There are no more plugs to lose or replace or holes to get clogged with dirt and debris. It has a quick charge feature that allows you to fully charge your battery pack in two hours. You can leave the battery pack on the charger as long as you want without damaging it. Accessory Beeper (sold separately): The G2 Field or G2 Pro Series has the built-in capability of remotely turning the Accessory Beeper on or off. Set the intensity dial to the proper position and press any button to activate the accessory beeper. The Tritronics Pro 500 G2 electronic dog training collar is a great choice for any breed of dog. The stimulation buttons are easily identifiable by touch so that you are always sure of your correction. The Tritronics Pro 500 G2 dog training shock collar is rugged, lightweight, and waterproof with insulated contact points which provide consistent stimulation in all training situations including water and wet conditions. The Tritonics Pro 500 G2 has a reliable 1-mile range for true long range control over your dog. An adjustable dog collar strap fits all dogs and the 6-way button guard prevents accidental stimulation. Both the transmitter and dog training collar are powered by rechargeable batteries which can be removed and replaced by you. Difference between the Tritronics Pro 500 G2 and the Tritronics Pro 100 G2 & Tritronics Pro 200 G2 is: the Pro 500 G2 has 18 levels of Continuous Stimulation & 18 levels of Momentary Stimulation for a total of 36 levels of stimulation. The Tritronics Pro 100 G2 & Pro 200 G2, each feature 24 levels of stimulation. Defintition of Momentary & Continuous Stimulation on a Tritronics Dog Training Collar: Momentary Stimulation is the dog will only be corrected for 1/400th of a second no matter how long you press the correction button (useful for hunting) and Continuous Stimulation will stimulate your dog up to 10 seconds if you keep you finger on the correction button. Features: A versatile choice for all-around use. 18 levels of continuous stimulation (NEW! Level 6). 6 each of low, medium, and high 18 levels of momentary stimulation (NEW! Level 6). 6 each of low, medium, and high Insulated contact points are made from surgical stainless steel. Comes with short 1/2" points, long 3/4" points and changing wrench. Waterproof collar & transmitter 1-mile range. Instantly change stimulation intensity from the transmitter. Long and short removable contact points (NEW!). Audible tone in the collar. No external collar antenna. Rechargeable batteries and chargers. Adjustable collar strap. Carrying case. Button guard. Basic Training Video and Manual. 2-year warranty