Firekingdom Portable Puppy Dog Pet Electric Fence Fencing Shock Collar System Receiver Black The receiver is compact and portable to carry Suitable for those stubborn or hard-to-train pets Train your pet with warning beep and safe vibration & shock correction Power Supply: 1 x 4LR44 6V Battery Package Includes: 1 x Bulb 2 x Screws 1 x Receptor 1 x Battery