Remote activation and range - Upgrade Bark Control Device with Remote Control: activate when a dog barks outside the 33 ft detection range. Press and hold the remote button for 2 seconds to run for 8 seconds, then it returns to standby. Adjustable ultrasonic frequencies - 4 adjustable levels: Mode I - Ultrasonic Low 15 kHz / High 20 kHz; Mode II - Ultrasonic Low 25 kHz / High 30 kHz. Suitable for most dog breeds and sizes. Not for deaf or hearing-impaired dogs. Some dogs may be initially fearful; use with patience. Safe for humans, effective for dogs - Ultrasonic sound is inaudible to humans and does not interfere with daily activities. Dogs respond to the frequencies, which can be adjusted via the remote to find the most effective setting. May be less effective for dogs with hearing loss or aggressive behavior. Long-lasting and waterproof - 2000 mAh rechargeable battery; full charge in 4 hours; up to 30 days of use per charge, 60 days in standby. IPX4 waterproof, suitable for indoor and outdoor use, including adverse weather. Helps deter barking from your own dog or a neighbor’s dog. Use scenarios - At home during quiet times to reduce ongoing barking. - In the yard to deter a neighbor’s dog from barking within range. - Outdoors during walks or in public spaces to minimize disturbances while training and managing barking.