Purchase this extra transmitter if you want to increase the range of your Instant Fence or need another transmitter at a second home. Use multiple transmitters to create overlaping containment areas allowing your dog greater mobility. The signal field can be adjusted anywhere from a 15 to 90 foot radius from the transmitter. The shape of the signal is in a perfect circle and the shape cannot be altered. The range of the Instant Fence can be increased by using two or more transmitters. This creates multiple intersecting circles, two transmitters would create a boundary in a shape similar to the MasterCard™ logo. The signal is cancelled where the circles intersect, allowing the pet access to the entire area. The transmitters can be located a maximum of 150 feet apart and each transmitter must be out of the weather, they cannot get wet. An additional transmitter would create a boundary that is up to 180 feet wide and up to 230 feet long.

Transmitter Specs: Height: 9" Width: 9" Depth: 8.5" Frequency: 18 kHz Fuse Type: 250 volt 1/2 amp (inside transmitter) Rounded front, or barrel shaped Light gray front On-Off switch on left Boundary control dial on face High-Low switch on face Power indicator light on face (red) Adapter: Model number: 300-089 (14v A/C 1800 ma)