The SportDOG Brand NoBark SBC- 8 is our easiest-to-use bark collar with its simple but effective design. Simply turn the collar on and place it on your dog. With eight levels of Progressive stimulation and our Silent Partner bark-detection technology, the SBC-8 will begin training immediately, only delivering consistent, reliable stimulation. The Progressive stimulation starts at the lowest level of static stimulation and increases each time your dog barks within 30 seconds. After 30 seconds of quiet, the collar will reset back to the lowest level. Also built with DryTek technology, this collar is waterproof and submersible to 7.5 metres, making it a premium system at a value price. Replaceable 6V battery (4L R44) Lasts 200 hours per battery.