The rechargeable Dogtra YS300 is a bark activated no-bark collar made for small to medium sized dogs. The sound recognition sensor uses a microprocessor to distinguish between the dog’s bark and the surrounding ambient noise. The YS300 is fully waterproof and includes a long lasting 2-hour rapid charge battery, with the charger included, and with an LED battery life indicator to remind you when the unit needs charging. Operating the YS300 is easy with 6 intensity levels that help find the right stimulation for your dog. The non-stimulating Vibration feature provides a warning prior to any stimulation.