Safe, Effective, Easy Setup: The dog bark collar has 4 working modes; 5 adjustable sensitivity levels. Just press the M button at any time to enjoy quiet time. Please refer to the user manual before use for optimal performance and safety Fast Charging & Waterproof: The bark collar for medium dogs features new charging for simple operation and more stable charging; A full charge in 2 hours works for about 15-20 days; The bark collar for large dogs has an IP67 waterproof design, so you can enjoy training time with your dog in the pool Our product quality assurance, our company's slogan is: not the pursuit of lower prices, but the pursuit of the highest Welcome to our shop, we will provide you with quality products and the most preferential price high quality goods wholesale, good work.