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Dogtra Remote Release Deluxe Extra Receiver RR-ER dog collar.

Dogtra Training Collars offers a user-friendly training collars that are designed for the most demanding training conditions. Dogtra offers a complete line of training collars  from small-breed pet trainers to a variety of sporting dog units. Most Dogtra e-collars are fully waterproof both the transmitter and the collar. The 175NCP has a water-resistant hand held transmitter. Dogtra offers a full line of e-collars with different ranges for a variety of uses: 1 mile, 3/4 mile, 1/2 mile and 400 yards.
Receiver and Collar Size:
Dogtra low/medium output units (175, 300, 280 and 7000) have a reduced receiver designed for dogs as small as 15lbs. Dogtra low/high output receivers can be used comfortably on dogs as small as 20 lbs.
Dogtra Stimulation:
Dogtra stimulation uses Exact-Stim, stimulation control offers the precise correction level for every dog's temperament. The Exact-Stim gives you a wide range of stimulation without jumps in between levels. Dogtra offers a pager which is a non-stimulating attention getter where the receiver vibrates to get the dog attention without stimulation. Nick is a momentary rapid burst of stimulation to get your dogs attention. Constant stimulation is on as long as you hold the button down and is used for demanding training situations or for stubborn dogs.