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 new Field 90 G2 is simple to operate and value-priced. It’s the answer if you prize simplicity but want the benefits of momentary as well as continuous stimulation. With just two buttons, one for 6 levels of continuous and one for 6 levels of momentary stimulation, you always know what correction you’re giving. No-stimulation signal tone is operated with a separate button. The Field 90 G2 comes with two transmitter antennas: the standard 7-inch antenna for a 1-mile range, and our new Mighty Micro Antenna, This tiny inch and a half long wonder gets you an amazing 60% of your regular range while giving you a more convenient transmitter profile any time long range isn’t critical. The Field 90 is available in 1, 2, and 3 dog models Features of the Tritronics Field 90 G2 6 levels of continuous stimulation (red button) 6 levels of momentary stimulation (black button) Insulated contact points are made from surgical stainless steel. Comes with short 1/2" points, long 3/4" points and changing wrench. Instantly change stimulation intensity from the transmitter Loud audible tone in the collar No stimulation "N" safety position on the transmitter ON/OFF switch activated at the collar Extended battery life One dual lead charger services the transmitter and the receiver Trickle charge mode Field chargeable, Field Charger is sold separately Waterproof collar & transmitter Insulated contact points to ensure consistent and reliable stimulation in the water 1-mile range Mighty Micro transmitter antenna included at no extra charge (60% of normal range) No external collar antenna Adjustable black collar strap with a square double buckle, and metal keeper Rugged foam lined carrying case Removable button guard Basic Training Video and Manual 30 Day money back guarantee 2 Year warranty