The Dogtra IQ-Plus Additional Receiver Orange Strap is a small compact electronic dog collar for small dogs; it allows you to train two dogs simultaneously with the Dogtra IQ-Plus. This is a waterproof receiver and the collar has low to medium power. The unit has a 400 yard range.
The Dogtra IQ-Plus Additional Receiver Orange Strapis one of the most powerful e-collars available with all its features and training modes: it has training modes in Nick, Constant, as well as a patented non-stimulating Pager Vibration, much like the vibrate feature on your smartphone.
Here is a nice tutorial to see how to use the Dogtra IQ-Plus Collar.