Happiness is a well-behaved dog. The Educator Remote Training Collar is made specially to help you make your bad dog good and your good dog better! The Educator Zen-300-TV 1/2-mile dog training collar system is loaded with features, making it the most humane and effective trainer available. Made for smaller hands or situations where discretion is important, the waterproof mini transmitter remote is 2.64" diameter x 1.29" thick. The receiver emits a tapping sensation, similar to intense vibration, and includes a Pavlovian tone delivering clean, effective stimulation. The user-selectable levels range from 1 to 100 with "lock and set" technology to prevent overstimulation. A boost feature with a range of 1 to 60 gets your dog's attention when extra stimulation is needed. The transmitter "stopwatch" design is ergonomic, controls a tracking light with either flash or continuous on the receiver for use after dark. A beeper can be turned on to help locate a lost transmitter. System is for dogs 5 pounds and larger, includes miniature waterproof floating transmitter remote with lanyard, waterproof miniature receiver, 3/4" x 30" waterproof, odorproof Biothane collar, rechargeable lithium polymer batteries charge in just 2 hours, battery charger (120V/220V), test light, contact points (5/8" and 3/4"), contact point installation tool, and color storage box. Bundle also includes E-Collar 101 off-leash four session training DVD. We strive to make you successful with your training collar and your complete satisfaction is our only concern. We offer a two-year warranty against defects. Please refer to included owner's manual for training tips or call toll-free for expert help with set-up, training, troubleshooting and registering your Educator product. Live US phone support is available Monday through Friday between 8 am and 7 pm Eastern.