SportDog FieldTrainer 425X Remote Dog Training Collar, 500 Yds.Sportdog fieldtrainer 425x, smallest & lightest e collar, built for in the field training or hunting with close working dogs, consistency & perfect timing are critical to developing your sporting dog, so the remote is quickly & easily operated without having to look at it, which lets you focus on your dog & not your equipment, with only a slight movement of the dial & the push of a button, you will be able to deliver a tone, vibration, or one of the