PetSafe YardMax Rechargeable in-Ground Dog and Cat Containment Fence, for Dogs and Cats Over 5 lb, Up to 30% More Play Area, Waterproof Receiver Collar with Tone/Static Correction UP TO 30% MORE PLAY AREA - give your pets more yard to safely play outdoors; maximizes the amount of pet protection with seemingly endless boundary RECHARGEABLE, WATERPROOF RECEIVER COLLAR - quickly charges in 2-3 hours with each charge can last up to 3 weeks depending on use ADJUSTABLE RECEIVER COLLAR - with 5 levels of static correction and tone, fits pets 5 pounds or more with neck sizes 6 to 26 inches UP TO 1/3 OF AN ACRE COVERAGE - expandable up to 10 acres with the purchase of additional wires and flags (sold separately) COMPATIBLE WITH PAWZ AWAY - works with Pawz Away Mini, Threshold, Indoor and Outdoor Pet Barriers to help pets avoid special areas around your home PERFECTFIT AND READYTEST FEATURES - special features to ensure the receiver collar is ready and working YardMax Mode provides your pet with up to 30% more play area Up to 1/3 acre of coverage with included wire and expandable up to 10 acres with purchase of additional wire Customize your boundary to your yard Receiver collar is rechargeable and waterproof Up to 1/3 acre coverage with wire included, but can expand up to 10 acres with the purchase of additional wire Indicator lights let you know if wires are broken or disconnected Includes a Surge Protector to help keep your fence safe from power surges and lightening strikes 5 levels of static correction plus 1 tone (beep) only level Waterproof Collar quickly charges in 2-3 hours; each charge can last up to 3 weeks Fits dogs over 5 lb. with neck sizes from 6 - 26 in. Kit includes 50 flags (additional flags can be purchases separately) Place each flag about 5 steps apart along your boundary Slowly remove the flags during days 15-30 of training as your dog learns his boundary