The ET-300 Mini Educator 1/2 mile remote trainer uses an exclusive "blunt" stimulation for humane and effective remote dog training. Unique features of this expandable remote dog training system include: the ability to "Lock & Set" stimulation levels from 1 to 100 and boost levels ranging from 1 to 60 to customize stimulation to your dogs' temperament. The small transmitter (remote) is well-suited for small hands or situations that require discretion. The 2.4 ounce receiver (collar) provides stimulation that is suitable for small to large dogs and has a night tracking light that can be set to either solid or a flashing setting.