Using this receiver collar is easy. First, make sure you have a compatible transmitter. Attach the collar around your dog's neck, ensuring it fits properly (it should fit necks between 15 - 58 cm). Adjust the stimulation level according to your dog's needs; there are 5 levels to choose from. You can also use the tone - only mode to give your dog a beep alert. When your dog gets close to the boundary set by the wireless fence, the collar will activate. Remember, the collar has over - stimulation protection, so the stimulation will stop after 15 seconds. The collar is waterproof, so your dog can play in the rain or puddles without damaging it. To keep the collar working well, charge the battery regularly. It takes 2 - 3 hours to recharge, and the low - battery indicator will let you know when it's time. If you have multiple dogs, you can use this extra collar to include them all in the system.