PetSafe Stubborn Dog Extra Collar Super Receiver PRF-275-19 Type: Remote Trainers Material: The most powerful receiver on the market Ideal for extremely hard to train dogs Dogs that are consistently breaking through the boundary and need a stronger receiver Five Levels of Programmable Correction plus a vibration feature in the warning tone as an additional deterrent, Level one is warning only with vibration - ideal for initial training or very timid pets, Levels two thru four are for easy or average to train pets, Level five is for very hard to train or stubborn pets, Progressive Correction - if your pet attempts to leave the yard, the receiver will automatically increase the correction level until he returns, Anti Linger so the dog cannot stay in the warning zone and run down the battery, Levels are easily changed with a push of a button on the receiver Uses a common 9 volt battery providing a average battery life of 6-...