This extra Receiver Collar can be used to add another dog to any PetSafe® In-Ground Fence™ system or as a replace ment collar to the Stubborn Dog In-Ground Fence™ system. This collar is not a complete system and needs to be used with a compatible transmitter. Specifications * 4 adjustable levels of correction plus beep-only mode with vibration * Designed for larger dogs (over 40 pounds/18kg) * Uses 9-volt alkaline battery (not included) Product features * Highest intensity level available * For dogs 3.6 kg and up * Fits neck sizes 15 - 71 cm * 5 adjustable levels of static stimulation * Tone with vibration mode alerts your pet with a beep * Over Stimulation Protection: Stimulation stops after 30 seconds * Covers up to 13 ares (1/3 acre/0.13 hectares) with included boundary wire * For stubborn or hard-to-train dogs * Waterproof * Uses 1 x 9 Volt battery (included) * Battery usually lasts 1-3 months * Good/low battery indicator * Compatible with PetSafe® In-Ground Fence™ system