- Collar-receiver provides four adjustable correction levels plus beep and vibrate-only modes
- One collar-receiver included. System expands to include any number of dogs with purchase of additional collar-receivers (Model SDF-R)
- Low-battery indicator
- Collar uses a standard 9-volt battery (included). Up to 9 months use from a single battery.
- Built-in lightning protection
- 1,000 feet of wire and 100 flags included; expand the area with Wire and Flag Accessory Kit (SDF-WF)
- Wire-break alarm on transmitter
- "Anti-linger" feature on collar keeps dog from constantly testing the boundary by gradually increasing the correction level