Keep your pet safe in your yard without burying wires! Just plug the Transmitter into a standard wall outlet close to the area where you want to contain your pet. Charge the rechargeable Receiver Collar in 2-3 hours. The Transmitter communicates with your dog’s Receiver Collar and helps keep him in the designated area by first delivering a warning tone should he approach the containment perimeter and then by delivering a harmless but surprising electrical stimulation should he proceed further towards the containment edge. The system is portable, so you can bring it along with you! An unlimited number of pets can be added to the system as long as they wear a PetSafe® Wireless Receiver Collar. Key Features: *Completely portable, no wire to bury *Set-up in 1-2 hours *For outdoor use only *For dogs 2.3 kg and up *Fits neck sizes 15 - 58 cm *5 adjustable levels of static stimulation *Tone-only mode alerts your pet with a beep *Over Stimulation Protection: Stimulation stops after 15 seconds *Covers an adjustable circular area up to 3/4 acre/30 ares/0.3 hectare (64 metres in diameter) *Add extra transmitters to increase containment area *Add an unlimited number of pets with additional wireless *Add-A-Dog® Receiver Collars *Waterproof Receiver Collar *Uses rechargeable battery *Each charge *usually lasts 3 weeks *Battery recharges in 2-3 hours *Low battery indicator. System Includes:*Transmitter with Power Adaptor *Receiver Collar for neck sizes 15 cm to 58 cm *Receiver Charger *50 Training Flags *Test Light Tool *Short and long Contact Points for short or long-haired pets *Contact Point Wrench *Operating and Training Guide.