This Surestim  7002M is the two-dog system to the 7000M.  It is still designed with a smaller received for dogs over 15 lbs. 

As seen in the photo there is a switch at the top of the transmitter which will change from the orange to the black collar so you can control which collar is receiving the stimulation.

All the features are the same as the 7000M

• Nick, constant and vibration buttons for both collars
• rechargeable batteries
• LCD screen for view of stimulation setting and battery life
• 1/2 mile range
• Completely waterproof

Download owners manual for Dogtra Surestim 7002M