[Bad barking] When the sensor detects the dog's own bark, the warning sound and the electrostatic shock automatically operate and correct the waste bark by giving a warning to the pet dog. • [Safe for dogs] Something that operates seven times Within 1 minute, stop useless barking and the device enters automatic protection mode, so we guarantee that our pet dog is safe to be effective and easy to use. The nylon belt of this product has light reflection, it is easy to find a pet in a dark environment and at night. • [Useful and convenient] LCD display, easy to understand, easy operation. You can adjust 0 to 7 sounds, 0 to 7 electrostatic shocks, 0 to 7 barking sensitivity. • [Rechargeable waterproof] Built-in 500 mA batteries have FCC CE ROSH certification and can be used continuously for 15 to 20 days. The collar can adjust the length of 9 - 55 cm, it corresponds to small dogs, medium dogs and large dogs. • [Set] 1 * Receiver + 1 * USB Charging Cable 1 * Light Reflective Nylon Belt + 1 * Test Light + 1 * English Manual