Prevent nuisance barking and protect your dog from the risk of overcorrection with this premium SportDOG Brand™ no-hassle bark collars. The fully automated stimulation control needs no setup or programming, just drop in the battery and fasten the collar around the dog’s neck. The stimulation continues to rise as long as the barking continues and automatically resets after 30 seconds of silence. Unit is waterproof. The SBC-18 boasts 18 levels of stimulation and patented Perfect Bark™ technology, requiring both vibration and sound to begin stimulation. Unit also has a test mode. It fits 6"-28" neck sizes. It uses a 6-volt lithium battery module (included). Size: 2.1" x 1.1" x 1.1". Weight: 4.6 oz.