With a wireless remote controller and a receiver worn around the dog's neck the product can effectively control the aggressive dog caused by moody or overactive it also can convey the action orders from the master. - The valid distance is about 250 meters - Can send out seven different orders depending on your need: three kinds of action orders (BB sounds) three kinds of warning signals (strong/medium/weak three different degrees of spray) and a calling order (SOS Morse Mode) to regulate the dog's instant behaviors. They are controlled by seven different buttons on the remote controller separately. - After being trained by the product the dog will understand the orders from the master more quickly knowing what behaviors are prohibited and what are rewarded. - Package included: - 1 * Remote controller (1*9V included) - 1 * Antenna - 1 * Scentless spray - 1 * Small spray bottle - 1 * 110~250V AC adapter (US plug) - 1 * USB cable - 1 * Flat to Round plug adapter - 1 * Pet collar - 1 * English manual